I have "Tune-up Utilities 2006". It has a undelete utility, I can search for a file I accidentally deleted from the recycle bin. But if I don't specify a file it will show me all files that are in free space. The files in free space that I see are quite alarming, old system files. Some system files from the same day, it is when I highlight the date that the time appears.System files get updated/modified from time to time. Small changes, but the file changes none the less. I get worried that I might need these files. I have a empty file on my desktop that I put these files in to see if I get a error message before I finely delete(erase) them.