I have read the articles on the main pages of tips 4 pc that tell you how to speed up your computer. But I am not good with computers and files. Last time I tried to clean my computer I deleted important files that caused my to get a blue screen. And that was it for me. I had to get a computer guy to re-install window xp for me. It cost $300 by the time he had installed everything.
Now that I have read something on how to clean up files I am still a bit scared that I will end up having to pay all that money again.
Do you think I should get the computer guy to clean it for me?

It does seem a bit scary, however if you just use the system tools in Windows XP you can't go wrong. Its when you start deleting files manually that causes the big problems. I suggest you just use Defrag, Disc Cleanup, and maybe disable a few startup programs. You can also try removing programs that you installed yourself, and now no longer use. Do not un-install anything if you do not know what it is.

Here's Some tips on how to speed up your computer

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Mitz
Free Computer Help
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Brisbane Computers

I did it.. and everything seems to be fine..I only used the Windows System tools like you said. The computer is now running a bit faster. Is there anyhing else I should do?