If your computer has gotten really slow there are several other things you need to do:
1) Clear out the TEMP folder on your C drive (make sure you save your wallpaper somewhere else because it may be in this folder)
2) Defragment your hard drive (if you have never done this it will help A LOT) If you have the updated windows98 or higher when you try to defragment it will tell you if you need to run scan disk first, if it tells you to; do so. If you have windows95 to the non-updated windows98 you need to run scan disk before you defragment your hard drive.
Look at picture below for directions!!