Never re-activate Windows XP after a new re-installation.

This will only work if you have installed Windows XP on the computer once and have activated this. Moving this file to a different computer will NOT work. This is simply so you do not have to activate again. This helps if you are not near a phone or do not have Internet access. Simply copy the WPA.DBL from the c:\windows\system32 folder to a disk. Simply put it back in the same place once you re-install Windows XP.