A few years ago I got a free Compaq Presario, now the computer was slow to begin with so I put a faster hard drive in it and upgraded the RAM not there is not a full GB of ram in it but I just really want it for an internet machine, now with the new hard drive I reinstalled Windows XP Pro SP3 but now after loading Avast virus protection on it and Safari it runs terrible. Now I have activated the version of windows so its Legit, I have installed all the updates. Once the computer starts it is really slow and close to unusable, now I had Windows Task Manager open for a while and for at least 10 Minutes the CPU Usage was stable at 100% even at idle, now I did a lot of research and people were saying spyware, but all the software I downloaded was from a clean flash drive that is constantly checked for virus. Any comments or help would be greatly appreciated. Thank you very much- Patrick