If your computer is going slow - Control Alt Delete and go into Processes, sort by User Name and see which are using up the most CPU time:
If explorer is using more than 5%: right click on it, and go to End Task (not End Task Tree). Wait a little while and you to File > Run Task and type explorer into the bar. This will open it up again.
If its a download program: go into that program's tools menu and make sure you're not uploading more than you can to other users. Keep your maximum uploads at the right amount at all times.
If its any other program being run by Your Username: Right Click and End Task Tree, and try to see what closed down when you did it. If it was a program, and it keeps on doing it - consider reinstalling it. If it was a game; then your system is just too slow. If it didn't seem to close down anything - search Google for the name of the process and see what it comes up with. Check with Ad-Aware in this case too just to make sure.
If it is System Idle Process or System: don't worry, they always take up what isn't being used up by other processes.
If it is a system process: again try and search on google for it to make sure its a Windows Process. If it is a Windows Process then check everynow and then if it keeps doing it. Consider reinstalling Windows if it does. If it isn't a Windows Process - download Ad-Aware and have a look to see whats up.
If nothing is doing anything: consider asking somebody about the problem or reinstalling Windows.
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