Delete Temporary Files

There is a variety of temporary files residing in your PC which take up a lot of space and slow it down. These can be Temporary Internet Files, Windows Temp Folder, Log Files and others.

The location of these files varies from one Windows version to the other, thus it is much preferable to use a free utility in order to remove them.

Windows does provide such a utility called Disk Cleanup (In Windows XP go to Start -> All Programs ->System Tools->Disk Cleanup). A better alternative would be CCleaner which can be downloaded for free.

Defragment your hard drive