Last spring I built this computer that I'm using now and installed XP. It ran fine foe a while but started having some glitches. Matt and others gave me a couple of links for a 'registry repair'. Ran one of them, the glitches disappeared and the speed came back. Look for Advanced Windows Care V2 Personal, give it a try, and it might just fix your problems (and then, it might not ). Also, if you are running XP, Service Pack 3 has been released (SP3) by Microsoft and you might consider downloading that as well