If you have this program it is GREAT to clean your registry but do NOT and i repeat do NOT use the defrag optimizer program, it deletes certain .dll and corrupts major config files on your XP especially with SP2. If you go to download.com and look at the reviews this is rated bad but it did get the award for #1 system optimizer....so be aware of what functions you use for this program.

Tune Up Utilities 2004 much better program and will not do this But is not free...