I'n not aware of a program that will speed up your computer but many thing you can do to it will speed it up.
Things to speed it up a little:
1. On your web browser, go to Tools>Internet Options>
then click delete cookies, then delete temporary internet files, then clear history.
2. Go to: Start>Control Panal>Preformance and Maintenance>Free up space Hard Desk, then you take it from there.
3. Go to control panal. Then press search at top of the screen. Search Defragment. Click on result, then wait till its dont. (it might take a while)
Or go to Start Menu>Programs>Accessories>System Tools< then Disk Defragmentor, and defrag your hard discs.
4. Empty your recycle bin.
5. If you do, what type of pentium do you have?