There are some easy ways to speed up your comp a little which doesn't require any expert knowledge.
1. Remove bots/spyware etc.
Download AdAware (free at
http://www.lavasoftusa.com/ ), install and run it. It is pretty self explanatory.
2. Delete unused crap, registry keys etc.
Download crapcleaner ( free at
http://www.ccleaner.com/ ) install and run it. You're given an option to make backups of all your keys before cleaning so no worries there.
3. Defrag
If you right-click your hard drive in windows (the disc symbol that says "C:") and chose "tools", there's a defrag option. Turn that on before you go to bed (it will take hours) and the computer will do some internal organising that will help speed it up. You can't do anything else while it does this so do it before you got to sleep.
4. Eat plenty of fiber
