I use Disk Cleaner Regularly. A great little program.
Disk Cleaner is a free open source tool to quickly and easily free disk space that is used by temporary files like those in the system temporary folder, the Internet Explorer Cache and Cookies folder, and the Recycle Bin. Disk Cleaner is absolutely free from adware and spyware.
You might be surprised by how much space the temporary files on your drive are taking up.
http://www.diskcleaner.nl/ 
