Interesting, I've had SP1 since it came out, I've had no problems, run Norton regularly (once a week) defrag about once a month, and run Spybot every now and then. The only thing that can be a ***** to me that has to do with Half life is the console, it dosnt wanna stay binded to ~ lol, the HL thing on XP could also be something having to do with XP and HL on the same drives, because my XP is on C and HL on H, so that may be why I dont crash, but who knows.