Entered debugger on first-chance exception (Exception Code: 0xc0000005) (Page Fault) Memory at 0x00000000 could not be read: Page not present. kdb:> bt Eip: Frames: <78ec83ec> <94aaff94> Couldn't access memory at 0xAEFF94AE! kdb:> cont err:(../win32ss/user/user32/windows/message.c:1602) Exception when calling Ansi WndProc 00417410 Msg 2 pti B1DD85B8 Wndpti B1DD85B8 (../win32ss/user/ntuser/winpos.c:3210) err: NtUserSetWindowPos bad window handle! (../win32ss/gdi/eng/pdevobj.c:468) PDEVOBJ_bSwitchMode, ppdev = E1473458, pSurface = E189E3E0 (../win32ss/gdi/eng/pdevobj.c:521) leave, ppdev = E1473458, pSurface = E18AA7C0 (../win32ss/user/ntuser/painting.c:1520) err: EP: Another thread invalidated this window