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Most computers actually run slow because of a hidden part of your system, which is constantly being used by Windows. This part of your PC is called the "registry" and is the central database for Windows, which stores everything from your latest emails to your desktop wallpaper. It's one of the most important parts of Windows and can easily make your PC run slow.The more corrupt registry files your computer has, the more it struggles to read them.The files which makes it run slower and slower. To fix this, you simply need to use a registry cleaner http://cleanup-comuter-run-perfectly.com/ . These are small software tools which actually work by scanning through the registry and fixing any bad files that are in there. This then allows Windows to read as many files as it wants, when it wants to.

You can use a registry cleaner to clean up your computer and then make your computer faster,Why?the reason is that there may be some registry errors and remnant,corrupt files and temp files in your computer to cause "computer slow".

Every time you install and uninstall software on your computer and surfing online you create junk in the computer registry.over time, the registry can grow to enormous proportions, especially if the various programs you've installed do not do a good job of deleting and/or updating it's Registry entries.You need to scan and clean your computer with registry cleaner to make it fast.Good Registry Cleaner will improve your computer and Internet performance dramatically!

There are some comparison and review of TOP 5 registry cleaners.

http://speed-up-my-computer.com/

You can download and scan your computer for free.

1) Defrag.

2) Remove Internet history, cookies, files..

3) Scan your computer with a good free anti-virus (AVG,Avast,Ad-Aware)

4) Run an optimizer (Registry mechanic, Advanced SystemCare)

Thats about it :)

Install a new windows Xp service pack 2 , and try P.C booster & good luck with my best wishes

Do a spring clean,

Remove unused software.

Check your hardware drivers are upto date.

Download CCleaner and clear the rubbish.

Defragment.

AVG free and spybot are good ones to use and free and use both if you do.

Try Defragmenting your computer