I think your problem is software related, rather than hardware related. I'd suggest the heart of it lies in your comment:
"There might have been some other installed software because I let my family use my computer too."
You are unaware what's occurred on your system, and in one way or another Spyware or other problems will likely be slowing your system down. Please work through the suggestions made in the "Helping Yourself" sticky in the Security section of the Forum, and then report back here once you've eliminated those software issues.
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Grandad
Offline 3,826 posts
since Mar 2004