Computer is running extremely slow. Task manager shows "System", NOT "System Idle", to be using 97-100%. No other processes are running. Has been going on for about a week. Have updated MSSecurity Essentials and ran full scan, 0 found. Updated and ran Malwarebytes (took 16 hours!!), 0 found. Ran disk cleaner. No improvement. Ran defrag (took all day), no improvement. Uninstalled unused programs. No improvement. Ran CCleaner. No improvement. Downloaded HWMonitor to check temps, all were fine. My computer is older, so maybe that is the problem, but this problem seemed to happen overnight. My computer is AMD Sempron Processor 3100, using Windows XP. Any suggestions. By the way, this is first time I have ever posted online and I am not very computer savvy. Please don't be technical in answers, as I confuse easily! Thanks!