Windows Activation

Microsoft is irritating about activations. One of my friends had to reinstall Windows XP today and call Microsoft to reactivate, so I thought I would share this tip. If you backup C:\windows\system32\wpa.dbl and c:\windows\system32\wpa.bak you can copy these backups back after a reinstall, from "minimal" safemode, and windows will be reactivated without the fuss.