I just help speed up a couple clan mates computers thought i would share some simple ways to fix to help get that computer a little more faster..
first you wanna set you computer for best performance..
1. Go to your start menu and open control panel.
2. Click into systems ( in the control panel)
3. Click on the advanced tab
4. Click the settings for visual affects , processor shed, and memory exc.
5. Then click on the hole that says for best performance.
This will make you computer look old school but will go so much faster cause there isn't a bunch of crud running in the background you will notice a difference.
second i recommend you download ccleaner from
http://www.downloads.com its free and will find old files on your computer that hide and take up space.. It really is a great tool and its free.
third use firefox instead of windows explorer..
next check to c if you need to defrag your computer you can find that in start/accessories/system tools
I hope that help anyone...