This is a really cool effective product that I use almost every day. It cleans up all kinds of junk for a computer running MS Windows.

Check out this list of features list from http://www.ccleaner.com/features

Cleans the following Windows components:

• Internet Explorer: Temporary File Cache, URL History, Cookies, Hidden Index.dat files, Last download file location
• Firefox: Temporary File Cache, URL History, Cookies, Download manager
• Recycle Bin
• Clipboard
• Windows Temporary files
• Windows Log files
• Recent Documents (on the Start Menu)
• Run history (on the Start Menu)
• Windows XP Search Assistant history
• Windows XP old Prefetch data
• Windows memory dumps after crashes
• Chkdsk file fragments
• and more..

Best of all.  It's free for personal use!