1) don't know if it's been said before, but i always turn off any services i don't need running. just go to start>>run>>services.msc and disable anything from running you don't need. if you need any help just go to blackviper.com, look for windows service configurations on the left hand menu and follow that as a guideline. for instance, i have one for everday use, and one for gaming. the one for gaming is a real hardcore config, you can hear your cpu snoring inside your case lol. ....but not mine, mine's still struggling because it's so old and fragile. turning off certain services isn't just for performance sake either, some services left on by default in xp can pose a security risk, thing such as ' DCOM', are big security risks, and the worst thing is that almost everyone doesn't need it. but as usual, microsoft make it run by default, on every xp machine. 2) if you have a rather slow computer and find your os runs sluggish, as well as following steps 1, you can revert back to the old 'classic' look and feel in xp. just right click 'my computer' 'advanced' tab, performance settings, 'adjust for best performance'. 3) also, make sure you run spyware and virus scans regularly, cleanup once every day or couple of days, and defrag once a month or less. disable any startup items you think are not needed too.