I found this to be a very useful tool.

WebEradicator securely eradicates your PC activity histories and internet tracks. It can cover up your previous PC activity (emails read/saved/sent, websites visited, documents viewed, programs ran,etc), as well as eradicate selected files and directories that you specify. The program can be run manually or scheduled to run at user specified times, hourly or at system reboot. It comes with an option to run in stealth mode, allowing it to perform its cleaning actions invisibly in the background. WebEradicator also comes with a test mode, that allows you to test your settings, preview files to be deleted - without actually removing anything. In addition, a built in cookie manager allows you to keep a list of cookies and exclude them from the cleaning process. The program also supports plug-ins to extend the functionality.

can be downloaded at www.webattack.com