A quick butchers of an error message website suggests it may be:
0x000000F4: CRITICAL_OBJECT_TERMINATION
(Click to consult the online MSDN article.)
One of the many processes or threads crucial to system operation has unexpectedly exited or been terminated. As a result, the system can no longer function. Specific causes are many, and often best resolved by a careful history of the problem and the circumstances of the error message. One user, who experienced this on return from Standby mode on Win XP SP2, found the cause was that Windows was installed on a slave drive.

For more info try looking at the actual website and clicking on the link:

http://aumha.org/a/stop.htm