diff --git a/reactos/include/psdk/shellapi.h b/reactos/include/psdk/shellapi.h
index 0ec5510a089..3af5034076a 100644
--- a/reactos/include/psdk/shellapi.h
+++ b/reactos/include/psdk/shellapi.h
@@ -126,9 +126,6 @@ extern "C" {
#define SHGFI_SHELLICONSIZE 4
#define SHGFI_PIDL 8
#define SHGFI_USEFILEATTRIBUTES 16
-#define SHERB_NOCONFIRMATION 1
-#define SHERB_NOPROGRESSUI 2
-#define SHERB_NOSOUND 4
typedef WORD FILEOP_FLAGS;
typedef WORD PRINTEROP_FLAGS;
diff --git a/reactos/include/psdk/winbase.h b/reactos/include/psdk/winbase.h
index 21363ee54b3..cfc130ee007 100644
--- a/reactos/include/psdk/winbase.h
+++ b/reactos/include/psdk/winbase.h
@@ -850,7 +850,7 @@ typedef struct _WIN32_FIND_DATAW {
typedef enum _STREAM_INFO_LEVELS {
FindStreamInfoStandard
} STREAM_INFO_LEVELS;
-typedef struct _WIN32_FIND_STREAM_DATAW {
+typedef struct _WIN32_FIND_STREAM_DATA {
LARGE_INTEGER StreamSize;
WCHAR cStreamName[MAX_PATH + 36];
} WIN32_FIND_STREAM_DATA, *PWIN32_FIND_STREAM_DATA;
@@ -1085,9 +1085,6 @@ typedef LONG(CALLBACK *PTOP_LEVEL_EXCEPTION_FILTER)(LPEXCEPTION_POINTERS);
typedef PTOP_LEVEL_EXCEPTION_FILTER LPTOP_LEVEL_EXCEPTION_FILTER;
typedef void(APIENTRY *PAPCFUNC)(ULONG_PTR);
typedef void(CALLBACK *PTIMERAPCROUTINE)(PVOID,DWORD,DWORD);
-#if (_WIN32_WINNT >= 0x0500)
-typedef void(CALLBACK *WAITORTIMERCALLBACK)(PVOID,BOOLEAN);
-#endif
#if (_WIN32_WINNT >= 0x0600)
typedef DWORD (WINAPI *APPLICATION_RECOVERY_CALLBACK)(PVOID);
#endif
@@ -2196,9 +2193,6 @@ BOOL WINAPI MapUserPhysicalPagesScatter(PVOID*,ULONG_PTR,PULONG_PTR);
#ifdef UNICODE
typedef STARTUPINFOW STARTUPINFO,*LPSTARTUPINFO;
typedef WIN32_FIND_DATAW WIN32_FIND_DATA,*LPWIN32_FIND_DATA;
-#if (_WIN32_WINNT >= 0x0501)
-typedef WIN32_FIND_STREAM_DATA WIN32_FIND_STREAM_DATA,*LPWIN32_FIND_STREAM_DATA;
-#endif
typedef HW_PROFILE_INFOW HW_PROFILE_INFO,*LPHW_PROFILE_INFO;
typedef ENUMRESLANGPROCW ENUMRESLANGPROC;
typedef ENUMRESNAMEPROCW ENUMRESNAMEPROC;
diff --git a/reactos/include/psdk/winnls.h b/reactos/include/psdk/winnls.h
index fb51248218d..28750a00ca2 100644
--- a/reactos/include/psdk/winnls.h
+++ b/reactos/include/psdk/winnls.h
@@ -167,7 +167,9 @@ extern "C" {
#define WC_DEFAULTCHAR 0x0040
#define WC_ERR_INVALID_CHARS 0x0080
#define WC_COMPOSITECHECK 0x0200
+#if (WINVER >= 0x0500)
#define WC_NO_BEST_FIT_CHARS 0x0400
+#endif
#define CP_ACP 0
#define CP_OEMCP 1
@@ -426,7 +428,6 @@ extern "C" {
#define DATE_LTRREADING 16
#define DATE_RTLREADING 32
#define MAP_EXPAND_LIGATURES 0x2000
-#define WC_NO_BEST_FIT_CHARS 1024
#define CAL_SYEARMONTH 47
#define CAL_ITWODIGITYEARMAX 48
#define CAL_NOUSEROVERRIDE LOCALE_NOUSEROVERRIDE
diff --git a/reactos/include/psdk/winnt.h b/reactos/include/psdk/winnt.h
index d78f2fe49e9..d1138a501e1 100644
--- a/reactos/include/psdk/winnt.h
+++ b/reactos/include/psdk/winnt.h
@@ -2837,7 +2837,7 @@ typedef CONTEXT *PCONTEXT,*LPCONTEXT;
PVOID ExceptionAddress;
DWORD NumberParameters;
ULONG_PTR ExceptionInformation[EXCEPTION_MAXIMUM_PARAMETERS];
- } EXCEPTION_RECORD, *PEXCEPTION_RECORD, *LPEXCEPTION_RECORD;
+ } EXCEPTION_RECORD;
typedef EXCEPTION_RECORD *PEXCEPTION_RECORD;
@@ -3864,7 +3864,6 @@ typedef struct _IMAGE_BOUND_FORWARDER_REF {
WORD OffsetModuleName;
WORD Reserved;
} IMAGE_BOUND_FORWARDER_REF,*PIMAGE_BOUND_FORWARDER_REF;
-typedef void(NTAPI *PIMAGE_TLS_CALLBACK)(PVOID,DWORD,PVOID);
typedef struct _IMAGE_RESOURCE_DIRECTORY {
DWORD Characteristics;
DWORD TimeDateStamp;
@@ -4381,9 +4380,6 @@ typedef enum _POWER_INFORMATION_LEVEL {
ProcessorPowerPolicyCurrent
} POWER_INFORMATION_LEVEL;
-#if (_WIN32_WINNT >= 0x0500)
-typedef LONG (WINAPI *PVECTORED_EXCEPTION_HANDLER)(PEXCEPTION_POINTERS);
-#endif
#if 1 /* (WIN32_WINNT >= 0x0500) */
typedef struct _SYSTEM_POWER_INFORMATION {
ULONG MaxIdlenessAllowed;
diff --git a/reactos/include/psdk/winuser.h b/reactos/include/psdk/winuser.h
index c29848fc4fe..2682662525f 100644
--- a/reactos/include/psdk/winuser.h
+++ b/reactos/include/psdk/winuser.h
@@ -1779,14 +1779,6 @@ extern "C" {
#define WM_CHANGEUISTATE 295
#define WM_UPDATEUISTATE 296
#define WM_QUERYUISTATE 297
-#define UIS_SET 1
-#define UIS_CLEAR 2
-#define UIS_INITIALIZE 3
-#define UISF_HIDEFOCUS 1
-#define UISF_HIDEACCEL 2
-#if(_WIN32_WINNT >= 0x0501)
-#define UISF_ACTIVE 4
-#endif /* _WIN32_WINNT >= 0x0501 */
#endif /* _WIN32_WINNT >= 0x0500 */
#endif /* _WIN32_WCE */
#define BM_CLICK 245
@@ -2470,14 +2462,10 @@ extern "C" {
#define HBMMENU_POPUP_RESTORE ((HBITMAP)9)
#define HBMMENU_POPUP_MAXIMIZE ((HBITMAP)10)
#define HBMMENU_POPUP_MINIMIZE ((HBITMAP)11)
-#define MOD_ALT 1
-#define MOD_CONTROL 2
-#define MOD_SHIFT 4
-#define MOD_WIN 8
-#define MOD_IGNORE_ALL_MODIFIER 1024
-#define MOD_ON_KEYUP 2048
-#define MOD_RIGHT 16384
-#define MOD_LEFT 32768
+#define MOD_ALT 0x0001
+#define MOD_CONTROL 0x0002
+#define MOD_SHIFT 0x0004
+#define MOD_WIN 0x0008
#define LLKHF_EXTENDED 0x00000001
#define LLKHF_INJECTED 0x00000010
#define LLKHF_ALTDOWN 0x00000020
@@ -2643,10 +2631,10 @@ extern "C" {
#define RIM_TYPEMOUSE 0x00000000
#define RIM_TYPEKEYBOARD 0x00000001
#define RIM_TYPEHID 0x00000002
-#define MOUSE_MOVE_RELATIVE 0x00000000
-#define MOUSE_MOVE_ABSOLUTE 0x00000001
-#define MOUSE_VIRTUAL_DESKTOP 0x00000002
-#define MOUSE_ATTRIBUTES_CHANGED 0x00000004
+#define MOUSE_MOVE_RELATIVE 0
+#define MOUSE_MOVE_ABSOLUTE 1
+#define MOUSE_VIRTUAL_DESKTOP 0x02
+#define MOUSE_ATTRIBUTES_CHANGED 0x04
#define RI_MOUSE_LEFT_BUTTON_DOWN 0x0001
#define RI_MOUSE_LEFT_BUTTON_UP 0x0002
#define RI_MOUSE_RIGHT_BUTTON_DOWN 0x0004
@@ -2869,7 +2857,6 @@ typedef struct {
short cx;
short cy;
} DLGTEMPLATE,*LPDLGTEMPLATE,*LPDLGTEMPLATEA,*LPDLGTEMPLATEW;
-typedef const DLGTEMPLATE *LPCDLGTEMPLATE;
typedef const DLGTEMPLATE *LPCDLGTEMPLATEA;
typedef const DLGTEMPLATE *LPCDLGTEMPLATEW;
#ifdef UNICODE
diff --git a/reactos/include/reactos/win32k/callback.h b/reactos/include/reactos/win32k/callback.h
index 903a457bab7..feecdd1c8f5 100644
--- a/reactos/include/reactos/win32k/callback.h
+++ b/reactos/include/reactos/win32k/callback.h
@@ -51,8 +51,6 @@ typedef struct _HOOKPROC_CBT_CREATEWND_EXTRA_ARGUMENTS
/* WCHAR szClass[] */
} HOOKPROC_CBT_CREATEWND_EXTRA_ARGUMENTS, *PHOOKPROC_CBT_CREATEWND_EXTRA_ARGUMENTS;
-typedef VOID (*WINEVENTPROC)(HWINEVENTHOOK,DWORD,HWND,LONG,LONG,DWORD,DWORD);
-
typedef struct _EVENTPROC_CALLBACK_ARGUMENTS
{
HWINEVENTHOOK hook;