New to the forum. Please bear with me if there is a similar post somewhere (please let me know the link) I am running XP SP2 with all the updates current. I got BSOD sometimes when I startup windows xp, but not all the time (1 out of eight tries). Once Windows is started, it can run days without a problem. Error code is 100000c5 most of the time, but sometimes different error code (100000a, 00000019...) also appears. Running "Windows Memory Diagnostic" yields no error. Any help is appreciated!