STOP 0x000000AB: SESSION_HAS_VALID_POOL_ON_EXIT
Usual causes: A bug in Win32k.sys, Atmfd.dll, Rdpdd.dll, or a video driver.
All the above named files are display -related, Win32k, an MS driver for the graphics subsystem, an Adobe font library dll and MS Remote Desktop/Terminal Services? display dll:
WinDbg Output Example:
SESSION_HAS_VALID_POOL_ON_EXIT (ab)
Caused by a session driver not freeing its pool allocations prior to a
session unload. This indicates a bug in win32k.sys, atmfd.dll,
rdpdd.dll or a video driver.
Arguments:
Arg1: 0000000000000000, session ID
Arg2: 0000000000000000, number of paged pool bytes that are leaking
Arg3: 0000000000000000, number of nonpaged pool bytes that are leaking
Arg4: 0000000000000000, total number of paged and nonpaged allocations that are leaking.
nonpaged allocations are in the upper half of this word,
paged allocations are in the lower half of this word.
Okay, so if we give MS benefit of the doubt and blame the 3rd party graphics drivers, can you either roll back the drivers from Device Manager or install the latest drivers for your card?
I would also block Windows Update from checking for/installing hardware drivers as well, at least during troubleshooting.