diff --git a/reactos/boot/freeldr/freeldr/arch/amd64/winldr.c b/reactos/boot/freeldr/freeldr/arch/amd64/winldr.c
index 710bb475efb..5091c8047da 100644
--- a/reactos/boot/freeldr/freeldr/arch/amd64/winldr.c
+++ b/reactos/boot/freeldr/freeldr/arch/amd64/winldr.c
@@ -384,7 +384,7 @@ void WinLdrSetupMachineDependent(PLOADER_PARAMETER_BLOCK LoaderBlock)
     PcrBasePage = Pcr >> MM_PAGE_SHIFT;
     if (Pcr == 0)
     {
-        UiMessageBox("Can't allocate PCR\n");
+        UiMessageBox("Can't allocate PCR.");
         return;
     }
     RtlZeroMemory((PVOID)Pcr, 2 * MM_PAGE_SIZE);
@@ -400,7 +400,7 @@ void WinLdrSetupMachineDependent(PLOADER_PARAMETER_BLOCK LoaderBlock)
     GdtIdt = (PKGDTENTRY)MmAllocateMemoryWithType(NumPages * MM_PAGE_SIZE, LoaderMemoryData);
     if (GdtIdt == NULL)
     {
-        UiMessageBox("Can't allocate pages for GDT+IDT!\n");
+        UiMessageBox("Can't allocate pages for GDT+IDT!");
         return;
     }
 
diff --git a/reactos/boot/freeldr/freeldr/arch/i386/drivemap.c b/reactos/boot/freeldr/freeldr/arch/i386/drivemap.c
index 177e47042c4..416cc19abe9 100644
--- a/reactos/boot/freeldr/freeldr/arch/i386/drivemap.c
+++ b/reactos/boot/freeldr/freeldr/arch/i386/drivemap.c
@@ -30,16 +30,15 @@ ULONG        DriveMapHandlerSegOff = 0;    // Segment:offset style address of ou
 #ifndef _MSC_VER
 VOID DriveMapMapDrivesInSection(PCSTR SectionName)
 {
-    CHAR            SettingName[80];
-    CHAR            SettingValue[80];
-    CHAR            ErrorText[260];
-    CHAR            Drive1[80];
-    CHAR            Drive2[80];
-    ULONG                SectionId;
-    ULONG                SectionItemCount;
-    ULONG                Index;
-    ULONG                Index2;
-    DRIVE_MAP_LIST    DriveMapList;
+    CHAR           SettingName[80];
+    CHAR           SettingValue[80];
+    CHAR           Drive1[80];
+    CHAR           Drive2[80];
+    ULONG          SectionId;
+    ULONG          SectionItemCount;
+    ULONG          Index;
+    ULONG          Index2;
+    DRIVE_MAP_LIST DriveMapList;
 
     RtlZeroMemory(&DriveMapList, sizeof(DRIVE_MAP_LIST));
 
@@ -62,8 +61,7 @@ VOID DriveMapMapDrivesInSection(PCSTR SectionName)
                 // Make sure we haven't exceeded the drive map max count
                 if (DriveMapList.DriveMapCount >= 4)
                 {
-                    sprintf(ErrorText, "Max DriveMap count exceeded in section [%s]:\n\n%s=%s", SectionName, SettingName, SettingValue);
-                    UiMessageBox(ErrorText);
+                    UiMessageBox("Max DriveMap count exceeded in section [%s]:\n\n%s=%s", SectionName, SettingName, SettingValue);
                     continue;
                 }
 
@@ -88,8 +86,7 @@ VOID DriveMapMapDrivesInSection(PCSTR SectionName)
                 // Make sure we got good values before we add them to the map
                 if (!DriveMapIsValidDriveString(Drive1) || !DriveMapIsValidDriveString(Drive2))
                 {
-                    sprintf(ErrorText, "Error in DriveMap setting in section [%s]:\n\n%s=%s", SectionName, SettingName, SettingValue);
-                    UiMessageBox(ErrorText);
+                    UiMessageBox("Error in DriveMap setting in section [%s]:\n\n%s=%s", SectionName, SettingName, SettingValue);
                     continue;
                 }
 
diff --git a/reactos/boot/freeldr/freeldr/arch/i386/winldr.c b/reactos/boot/freeldr/freeldr/arch/i386/winldr.c
index 15c4f52907b..6cc099fd645 100644
--- a/reactos/boot/freeldr/freeldr/arch/i386/winldr.c
+++ b/reactos/boot/freeldr/freeldr/arch/i386/winldr.c
@@ -365,7 +365,7 @@ void WinLdrSetupMachineDependent(PLOADER_PARAMETER_BLOCK LoaderBlock)
 
     if (Pcr == 0)
     {
-        UiMessageBox("Can't allocate PCR\n");
+        UiMessageBox("Can't allocate PCR.");
         return;
     }
 
@@ -384,7 +384,7 @@ void WinLdrSetupMachineDependent(PLOADER_PARAMETER_BLOCK LoaderBlock)
 
     if (GdtIdt == NULL)
     {
-        UiMessageBox("Can't allocate pages for GDT+IDT!\n");
+        UiMessageBox("Can't allocate pages for GDT+IDT!");
         return;
     }
 
diff --git a/reactos/boot/freeldr/freeldr/disk/ramdisk.c b/reactos/boot/freeldr/freeldr/disk/ramdisk.c
index 6998f2828a7..0afc702aa1d 100644
--- a/reactos/boot/freeldr/freeldr/disk/ramdisk.c
+++ b/reactos/boot/freeldr/freeldr/disk/ramdisk.c
@@ -155,7 +155,7 @@ RamDiskLoadVirtualFile(IN PCHAR FileName)
     //
     if (Information.EndingAddress.HighPart != 0)
     {
-        UiMessageBox("RAM disk too big\n");
+        UiMessageBox("RAM disk too big.");
         FsCloseFile(RamFile);
         return FALSE;
     }
@@ -172,7 +172,7 @@ RamDiskLoadVirtualFile(IN PCHAR FileName)
     gRamDiskBase = MmAllocateMemoryWithType(gRamDiskSize, LoaderXIPRom);
     if (!gRamDiskBase)
     {
-        UiMessageBox("Failed to allocate memory for RAM disk\n");
+        UiMessageBox("Failed to allocate memory for RAM disk.");
         FsCloseFile(RamFile);
         return FALSE;
     }
@@ -222,7 +222,7 @@ RamDiskLoadVirtualFile(IN PCHAR FileName)
             gRamDiskBase = NULL;
             gRamDiskSize = 0;
             FsCloseFile(RamFile);
-            UiMessageBox("Failed to read RAM disk\n");
+            UiMessageBox("Failed to read RAM disk.");
             return FALSE;
         }
     }
diff --git a/reactos/boot/freeldr/freeldr/freeldr.c b/reactos/boot/freeldr/freeldr/freeldr.c
index 43a020d592b..ea527e86ecd 100644
--- a/reactos/boot/freeldr/freeldr/freeldr.c
+++ b/reactos/boot/freeldr/freeldr/freeldr.c
@@ -41,13 +41,13 @@ VOID BootMain(LPSTR CmdLine)
 
     if (!UiInitialize(FALSE))
     {
-        UiMessageBoxCritical("Unable to initialize UI.\n");
+        UiMessageBoxCritical("Unable to initialize UI.");
         goto Quit;
     }
 
     if (!MmInitializeMemoryManager())
     {
-        UiMessageBoxCritical("Unable to initialize memory manager");
+        UiMessageBoxCritical("Unable to initialize memory manager.");
         goto Quit;
     }
 
diff --git a/reactos/boot/freeldr/freeldr/linuxboot.c b/reactos/boot/freeldr/freeldr/linuxboot.c
index ebc90733d00..c2c8f97e82c 100644
--- a/reactos/boot/freeldr/freeldr/linuxboot.c
+++ b/reactos/boot/freeldr/freeldr/linuxboot.c
@@ -82,7 +82,6 @@ LoadAndBootLinux(IN OperatingSystemItem* OperatingSystem,
     PCSTR Description = OperatingSystem->LoadIdentifier;
     PFILE LinuxKernel = 0;
     PFILE LinuxInitrdFile = 0;
-    CHAR  TempString[260];
 
     UiDrawBackdrop();
 
@@ -102,8 +101,7 @@ LoadAndBootLinux(IN OperatingSystemItem* OperatingSystem,
     LinuxKernel = FsOpenFile(LinuxKernelName);
     if (!LinuxKernel)
     {
-        sprintf(TempString, "Linux kernel \'%s\' not found.", LinuxKernelName);
-        UiMessageBox(TempString);
+        UiMessageBox("Linux kernel \'%s\' not found.", LinuxKernelName);
         goto LinuxBootFailed;
     }
 
@@ -113,8 +111,7 @@ LoadAndBootLinux(IN OperatingSystemItem* OperatingSystem,
         LinuxInitrdFile = FsOpenFile(LinuxInitrdName);
         if (!LinuxInitrdFile)
         {
-            sprintf(TempString, "Linux initrd image \'%s\' not found.", LinuxInitrdName);
-            UiMessageBox(TempString);
+            UiMessageBox("Linux initrd image \'%s\' not found.", LinuxInitrdName);
             goto LinuxBootFailed;
         }
     }
@@ -212,7 +209,6 @@ LinuxBootFailed:
 BOOLEAN LinuxParseIniSection(PCSTR SectionName)
 {
     ULONG_PTR SectionId;
-    CHAR SettingName[260];
 
     /* Find all the message box settings and run them */
     UiShowMessageBoxesInSection(SectionName);
@@ -220,8 +216,7 @@ BOOLEAN LinuxParseIniSection(PCSTR SectionName)
     /* Try to open the operating system section in the .ini file */
     if (!IniOpenSection(SectionName, &SectionId))
     {
-        sprintf(SettingName, "Section [%s] not found in freeldr.ini.\n", SectionName);
-        UiMessageBox(SettingName);
+        UiMessageBox("Section [%s] not found in freeldr.ini.", SectionName);
         return FALSE;
     }
 
diff --git a/reactos/boot/freeldr/freeldr/miscboot.c b/reactos/boot/freeldr/freeldr/miscboot.c
index badf4aadb92..50f68e9afc5 100644
--- a/reactos/boot/freeldr/freeldr/miscboot.c
+++ b/reactos/boot/freeldr/freeldr/miscboot.c
@@ -34,7 +34,6 @@ LoadAndBootBootSector(IN OperatingSystemItem* OperatingSystem,
     CHAR  FileName[260];
     PFILE FilePointer;
     ULONG BytesRead;
-    CHAR  SettingName[80];
 
     /* Find all the message box settings and run them */
     UiShowMessageBoxesInSection(SectionName);
@@ -42,8 +41,7 @@ LoadAndBootBootSector(IN OperatingSystemItem* OperatingSystem,
     /* Try to open the operating system section in the .ini file */
     if (!IniOpenSection(SectionName, &SectionId))
     {
-        sprintf(SettingName, "Section [%s] not found in freeldr.ini.\n", SectionName);
-        UiMessageBox(SettingName);
+        UiMessageBox("Section [%s] not found in freeldr.ini.", SectionName);
         return;
     }
 
@@ -56,8 +54,7 @@ LoadAndBootBootSector(IN OperatingSystemItem* OperatingSystem,
     FilePointer = FsOpenFile(FileName);
     if (!FilePointer)
     {
-        strcat(FileName, " not found.");
-        UiMessageBox(FileName);
+        UiMessageBox("%s not found.", FileName);
         return;
     }
 
@@ -97,7 +94,6 @@ LoadAndBootPartition(IN OperatingSystemItem* OperatingSystem,
 {
     ULONG_PTR SectionId;
     PCSTR SectionName = OperatingSystem->SystemPartition;
-    CHAR  SettingName[80];
     CHAR  SettingValue[80];
     PARTITION_TABLE_ENTRY PartitionTableEntry;
     UCHAR DriveNumber;
@@ -109,8 +105,7 @@ LoadAndBootPartition(IN OperatingSystemItem* OperatingSystem,
     /* Try to open the operating system section in the .ini file */
     if (!IniOpenSection(SectionName, &SectionId))
     {
-        sprintf(SettingName, "Section [%s] not found in freeldr.ini.\n", SectionName);
-        UiMessageBox(SettingName);
+        UiMessageBox("Section [%s] not found in freeldr.ini.", SectionName);
         return;
     }
 
@@ -175,7 +170,6 @@ LoadAndBootDrive(IN OperatingSystemItem* OperatingSystem,
 {
     ULONG_PTR SectionId;
     PCSTR SectionName = OperatingSystem->SystemPartition;
-    CHAR  SettingName[80];
     CHAR  SettingValue[80];
     UCHAR DriveNumber;
 
@@ -185,8 +179,7 @@ LoadAndBootDrive(IN OperatingSystemItem* OperatingSystem,
     /* Try to open the operating system section in the .ini file */
     if (!IniOpenSection(SectionName, &SectionId))
     {
-        sprintf(SettingName, "Section [%s] not found in freeldr.ini.\n", SectionName);
-        UiMessageBox(SettingName);
+        UiMessageBox("Section [%s] not found in freeldr.ini.", SectionName);
         return;
     }
 
diff --git a/reactos/boot/freeldr/freeldr/windows/peloader.c b/reactos/boot/freeldr/freeldr/windows/peloader.c
index f733a2fccdf..916a1ed8fcd 100644
--- a/reactos/boot/freeldr/freeldr/windows/peloader.c
+++ b/reactos/boot/freeldr/freeldr/windows/peloader.c
@@ -282,7 +282,7 @@ WinLdrLoadImage(IN PCHAR FileName,
     Status = ArcOpen(FileName, OpenReadOnly, &FileId);
     if (Status != ESUCCESS)
     {
-        //UiMessageBox("Can not open the file");
+        // UiMessageBox("Can not open the file.");
         return FALSE;
     }
 
@@ -290,7 +290,7 @@ WinLdrLoadImage(IN PCHAR FileName,
     Status = ArcRead(FileId, HeadersBuffer, SECTOR_SIZE * 2, &BytesRead);
     if (Status != ESUCCESS)
     {
-        UiMessageBox("Error reading from file");
+        UiMessageBox("Error reading from file.");
         ArcClose(FileId);
         return FALSE;
     }
@@ -299,8 +299,8 @@ WinLdrLoadImage(IN PCHAR FileName,
     NtHeaders = RtlImageNtHeader(HeadersBuffer);
     if (!NtHeaders)
     {
-        //Print(L"Error - no NT header found in %s\n", FileName);
-        UiMessageBox("Error - no NT header found");
+        // Print(L"Error - no NT header found in %s\n", FileName);
+        UiMessageBox("Error - no NT header found.");
         ArcClose(FileId);
         return FALSE;
     }
@@ -308,8 +308,8 @@ WinLdrLoadImage(IN PCHAR FileName,
     /* Ensure this is executable image */
     if (((NtHeaders->FileHeader.Characteristics & IMAGE_FILE_EXECUTABLE_IMAGE) == 0))
     {
-        //Print(L"Not an executable image %s\n", FileName);
-        UiMessageBox("Not an executable image");
+        // Print(L"Not an executable image %s\n", FileName);
+        UiMessageBox("Not an executable image.");
         ArcClose(FileId);
         return FALSE;
     }
@@ -330,8 +330,8 @@ WinLdrLoadImage(IN PCHAR FileName,
 
         if (PhysicalBase == NULL)
         {
-            //Print(L"Failed to alloc pages for image %s\n", FileName);
-            UiMessageBox("Failed to alloc pages for image");
+            // Print(L"Failed to alloc pages for image %s\n", FileName);
+            UiMessageBox("Failed to alloc pages for image.");
             ArcClose(FileId);
             return FALSE;
         }
@@ -347,7 +347,7 @@ WinLdrLoadImage(IN PCHAR FileName,
     Status = ArcSeek(FileId, &Position, SeekAbsolute);
     if (Status != ESUCCESS)
     {
-        UiMessageBox("Error seeking to start of file");
+        UiMessageBox("Error seeking to start of file.");
         ArcClose(FileId);
         return FALSE;
     }
@@ -355,8 +355,8 @@ WinLdrLoadImage(IN PCHAR FileName,
     Status = ArcRead(FileId, PhysicalBase, NtHeaders->OptionalHeader.SizeOfHeaders, &BytesRead);
     if (Status != ESUCCESS)
     {
-        //Print(L"Error reading headers %s\n", FileName);
-        UiMessageBox("Error reading headers");
+        // Print(L"Error reading headers %s\n", FileName);
+        UiMessageBox("Error reading headers.");
         ArcClose(FileId);
         return FALSE;
     }
diff --git a/reactos/boot/freeldr/freeldr/windows/winldr.c b/reactos/boot/freeldr/freeldr/windows/winldr.c
index 2790cf52b07..1410f4fce46 100644
--- a/reactos/boot/freeldr/freeldr/windows/winldr.c
+++ b/reactos/boot/freeldr/freeldr/windows/winldr.c
@@ -682,7 +682,7 @@ LoadAndBootWindows(IN OperatingSystemItem* OperatingSystem,
         /* Load the ramdisk */
         if (!RamDiskLoadVirtualFile(FileName))
         {
-            UiMessageBox("Failed to load RAM disk file %s\n", FileName);
+            UiMessageBox("Failed to load RAM disk file %s", FileName);
             return;
         }
     }
diff --git a/reactos/boot/freeldr/freeldr/windows/wlmemory.c b/reactos/boot/freeldr/freeldr/windows/wlmemory.c
index 6e45f45b510..ef89b4ca0a6 100644
--- a/reactos/boot/freeldr/freeldr/windows/wlmemory.c
+++ b/reactos/boot/freeldr/freeldr/windows/wlmemory.c
@@ -220,7 +220,7 @@ WinLdrSetupMemoryLayout(IN OUT PLOADER_PARAMETER_BLOCK LoaderBlock)
     MemoryMap = MmGetMemoryMap(&NoEntries);
     if (MemoryMap == NULL)
     {
-        UiMessageBox("Can not retrieve the current memory map");
+        UiMessageBox("Can not retrieve the current memory map.");
         return FALSE;
     }
 
@@ -334,7 +334,7 @@ WinLdrSetupMemoryLayout(IN OUT PLOADER_PARAMETER_BLOCK LoaderBlock)
     /*Status = MempSetupPaging(OsLoaderBase >> MM_PAGE_SHIFT, OsLoaderSize >> MM_PAGE_SHIFT);
     if (!Status)
     {
-        UiMessageBox("Error during MempSetupPaging");
+        UiMessageBox("Error during MempSetupPaging.");
         return;
     }*/
 
diff --git a/reactos/boot/freeldr/freeldr/windows/wlregistry.c b/reactos/boot/freeldr/freeldr/windows/wlregistry.c
index 49638139b33..bebf15c0350 100644
--- a/reactos/boot/freeldr/freeldr/windows/wlregistry.c
+++ b/reactos/boot/freeldr/freeldr/windows/wlregistry.c
@@ -437,8 +437,7 @@ WinLdrLoadNLSData(IN OUT PLOADER_PARAMETER_BLOCK LoaderBlock,
     return TRUE;
 
 Failure:
-    //UiMessageBox("Error reading NLS file %s\n", Filename);
-    UiMessageBox("Error reading NLS file!");
+    UiMessageBox("Error reading NLS file %s", FileName);
     return FALSE;
 }