diff --git a/reactos/base/system/format/format.c b/reactos/base/system/format/format.c
index 5d2a166b68a..9b4962d0d22 100644
--- a/reactos/base/system/format/format.c
+++ b/reactos/base/system/format/format.c
@@ -276,7 +276,7 @@ static VOID Usage( LPTSTR ProgramName )
 	WCHAR szFormatW[MAX_PATH];
 	DWORD Index = 0;
 	BYTE dummy;
-	BOOLEAN lastestVersion;
+	BOOLEAN latestVersion;
 
 	LoadStringAndOem( GetModuleHandle(NULL), STRING_HELP, (LPTSTR) szMsg,RC_STRING_MAX_SIZE);
 	if (!LoadFMIFSEntryPoints())
@@ -286,9 +286,9 @@ static VOID Usage( LPTSTR ProgramName )
 	}
 
 	szFormats[0] = 0;
-	while (QueryAvailableFileSystemFormat(Index++, szFormatW, &dummy, &dummy, &lastestVersion))
+	while (QueryAvailableFileSystemFormat(Index++, szFormatW, &dummy, &dummy, &latestVersion))
 	{
-		if (!lastestVersion)
+		if (!latestVersion)
 			continue;
 		if (szFormats[0])
 			_tcscat(szFormats, _T(", "));
diff --git a/reactos/dll/win32/fmifs/query.c b/reactos/dll/win32/fmifs/query.c
index 93cfa8e00c9..da3f1d96702 100644
--- a/reactos/dll/win32/fmifs/query.c
+++ b/reactos/dll/win32/fmifs/query.c
@@ -15,12 +15,12 @@ QueryAvailableFileSystemFormat(
 	IN OUT PWCHAR FileSystem, /* FIXME: Probably one minimal size is mandatory, but which one? */
 	OUT UCHAR* Major,
 	OUT UCHAR* Minor,
-	OUT BOOLEAN* LastestVersion)
+	OUT BOOLEAN* LatestVersion)
 {
 	PLIST_ENTRY ListEntry;
 	PIFS_PROVIDER Provider;
 
-	if (!FileSystem || !Major ||!Minor ||!LastestVersion)
+	if (!FileSystem || !Major ||!Minor ||!LatestVersion)
 		return FALSE;
 
 	ListEntry = ProviderListHead.Flink;
@@ -38,7 +38,7 @@ QueryAvailableFileSystemFormat(
 	wcscpy(FileSystem, Provider->Name);
 	*Major = 0; /* FIXME */
 	*Minor = 0; /* FIXME */
-	*LastestVersion = TRUE; /* FIXME */
+	*LatestVersion = TRUE; /* FIXME */
 
 	return TRUE;
 }
diff --git a/reactos/dll/win32/setupapi/devinst.c b/reactos/dll/win32/setupapi/devinst.c
index 798c6ccb0fc..b7eeeef10d9 100644
--- a/reactos/dll/win32/setupapi/devinst.c
+++ b/reactos/dll/win32/setupapi/devinst.c
@@ -211,7 +211,7 @@ CheckSectionValid(
      * Field[3] Minor version
      * Field[4] Product type
      * Field[5] Suite mask
-     * Remark: lastests fields may be NULL if the information is not provided
+     * Remark: these fields may be NULL if the information is not provided
      */
     Fields[0] = Section;
     if (Fields[0] == NULL)
diff --git a/reactos/drivers/input/i8042prt/mouse.c b/reactos/drivers/input/i8042prt/mouse.c
index d6e224a4c59..cb66c353ada 100644
--- a/reactos/drivers/input/i8042prt/mouse.c
+++ b/reactos/drivers/input/i8042prt/mouse.c
@@ -214,7 +214,7 @@ i8042MouHandleButtons(
 		(DeviceExtension->MouseButtonState & ~Mask) | (NewButtonData & Mask);
 }
 
-/* Does lastest initializations for the mouse. This method
+/* Does final initializations for the mouse. This method
  * is called just before connecting the interrupt.
  */
 NTSTATUS
diff --git a/reactos/include/reactos/libs/fmifs/fmifs.h b/reactos/include/reactos/libs/fmifs/fmifs.h
index 98c4065639e..cdf87f504af 100644
--- a/reactos/include/reactos/libs/fmifs/fmifs.h
+++ b/reactos/include/reactos/libs/fmifs/fmifs.h
@@ -148,7 +148,7 @@ QueryAvailableFileSystemFormat(
 	IN OUT PWCHAR FileSystem, /* FIXME: Probably one minimal size is mandatory, but which one? */
 	OUT UCHAR* Major,
 	OUT UCHAR* Minor,
-	OUT BOOLEAN* LastestVersion);
+	OUT BOOLEAN* LatestVersion);
 
 BOOL NTAPI
 QueryDeviceInformation(