(subsystems/win32/win32k/ntuser/timer.c:418) Invalid window handle (subsystems/win32/win32k/objects/gdiobj.c:814) Attempted to lock object 0xfffff) (subsystems/win32/win32k/ntuser/timer.c:418) Invalid window handle Assertion 'KeGetCurrentIrql() <= APC_LEVEL' failed at ntoskrnl/include/internal4 Entered debugger on embedded INT3 at 0x0008:0x808c21ae. kdb:> bt Eip: Frames: <00000000> kdb:>