This old box is the perfect candidate for linux... xp is completely obsolete and the old girl doesn't have enough bang for the buck already spent (no point upgrading anything over 2 years old IMHO unless it's from salvage freebie bits and bobs.. never spend money, they ain't worth it).. won't run fista and as for glutton 7?.. waste of time as well..

If you MUST use winsleep then you can get a nice clean xp from the *cough usual places cough* and do a totally clean install.. a recovered thing after being screwed in the way described by malware will just reinfect itself as soon as it can and will never run any good!!

Try Sabayon i86.. impress your friends with something amazing!! http://www.sabayon.org/ (it isn't a 64 so you will need to look for the one they call i86 - thats the 32 bit version)