My computer was going very slow, and after multiple attempts to locate the problem, I formated and installed WinXP again. I was hoping that would fix the problem. It did not. I open the task manager and watched the processes. Firefox would start using 80-99% of the CPU after around 5 minutes of browsing. When it hit that I was unable to load any websites. Closing firefox did nothing. The process was still running at 80-99%. Nothing I did would end it. I could not reboot or shutdown. I had to hold on on/off button for a few seconds. So I got a different browser, and it happened again! Only this time I did not have firefox running. After a few minutes of browsing everything stopped. Looking at the task manager it was System Idle Process running from 80-99%. As I'm writing this, I'm looking at the computer that's causing this problem. Now System Idle Process looks normal BUT something else went up to 99%. Looking at the Task Manager again it shows System Idle Process at 99% again. What is going on here? This started happening a few days ago. Please help me! Thanks!