I found that on google. I have a few questions
-Do I use this when I have my Reformatting disk in the drive?
-When I use this, will it delete/remove my current files?
Official information is located here: http://support.microsoft.com/kb/307654
When you say "reformatting disk," I'm assuming you are referring to the Windows install CD.
This command should be safe as far as I can tell. I tried to test it myself, but I got the message "Setup cannot continue because the version of Windows on your computer is newer than the version on the CD." You apparently have to have a CD that matches the service pack installed on the sytem. (i.e. if you have Windows XP Service Pack 3, you need a Windows XP Service Pack 3 install CD.)