Well this is almost a hacking method, but more may find is very useful.
Open My Computer or an Explorer window.
Navigate to your “C” drive > windows > system32.
Scroll down to you get to WPA.DBL and WPA.BAK
Right click WPA.DBL and choose “send to” then pick where you want to copy it to. Do the same for WPA.BAK
Now you can perform your format and reinstall of XP. When you get to the Activation screen, decline to activate it and let the
Restart Windows in “Safe Mode” (Press F8 at start-up then when the Advanced Boot Options menu appears choose Safe Mode) your computer will boot into safe mode.
Navigate back to where you stored the WPA.DBL and WPA.BAK
In My Computer or an Explorer window navigate to where you stored the WPA.DBL and WPA.BAK.
Drag/drop your backed up WPA.DBL and WPA.BAK to “C:\windows\system32\ folder.
This will replace the existing file.
Reinstall all your programs and backed up files.