0x10000050 equals 0x00000050 errors.0x00000050: PAGE_FAULT_IN_NONPAGED_AREA
Requested data was not in memory. An invalid system memory address was referenced
. Defective memory (including main memory, L2 RAM cache, video RAM) or incompatible software (including remote control and antivirus software) might cause this Stop message, as may other hardware problems (e.g., incorrect SCSI termination or a flawed PCI card).
Worth reading: http://support.microsoft.com/?kbid=894278&sd=RMVP
Is XP current with critical updates installed?
AV program installed and updated?
Other malware-defense programs installed?
Any errors reflected in Event Viewer...to correspond with approximate times of error messages?
How To Use Event Viewer - http://www.bleepingcomputer.com/forums/t/40108/how-to-use-event-viewer/
Please read: Help Diagnosing BSODs And Crashes (BC) - http://www.bleepingcomputer.com/forums/t/176011/how-to-receive-help-diagnosing-blue-screens-and-windows-crashes/