Sadly, I can't write this is a good idea.
Be your own best defense....
Check for some very good utilities for this at this site or download.com. Also snapfiles.com
Search under "hard drive cleanup tools"
or "temp file cleanups"
My advice is to check with the documentation to be sure there is BACKUPS (so you can get back any files you delete) Your system restore on XP also protects you this way too.