How to reinstall XP without reactivating

Here is a trick that greatly interest those who often relocate their operating system and without the same again.

Simply do a search for the file wpa.dbl, or go to the search => windows/system32.

Then, make a copy of the file (on disk, partition or other disk ...).

Restore it at a forthcoming upgrade of Windows XP.
This trick works of course, if a first activation has already been made.