5 ways to speed up your PC

By following a few simple guidelines, you can maintain your computer and keep it running smoothly. This article discusses how to use the tools available in Windows 7, Vista, and XP Service Pack 3 (SP3) to more efficiently maintain your computer and safeguard your privacy when you're online.

1. Free up disk space
The Disk Cleanup tool helps you free up space on your hard disk to improve the performance of your computer. The tool identifies files that you can safely delete, and then enables you to choose whether you want to delete some or all of the identified files.
Use Disk Cleanup to:

Remove temporary Internet files.

Remove downloaded program files (such as Microsoft ActiveX controls and Java applets).

Empty the Recycle Bin.

Remove Windows temporary files such as error reports.

Remove optional Windows components that you don't use.

Remove installed programs that you no longer use.

Remove unused restore points and shadow copies from System Restore.

Tip: Typically, temporary Internet files take the most amount of space because the browser caches each page you visit for faster access later.

taken from microsoft webiste