WAYS TO KEEP YOUR COMPUTER FAST

1. Make sure that your computer hard drive is clean. Download a softer called cleaner or tune utilities.
2. Don't download sofware from just any wesite. Make sure it is trusted and delete it if it is useless.
3. Using programs to keep you computer clean is not the exact right idea.
4. Run disk cleanup once a week to remove unnecessary (temporary files) files.
5.Run disk defragmeter to defrag you hard disk onece a month (you don't need to over do it)

6. Defragment before installing new programs so they will not get fragmented incase there are gaps in the hard drive media when it could be installed.
7. Keep your computer safe from viruses by making sure that you use a safe web browser.
8. Use a good anti-virus (and you might use internet virus security) and the Windows Firewall.

Source: http://www.wikihow.com/Keep-Your-Computer-Fast,-Clean,-Safe-and-Good-Looking