Don't Re-Activate Windows!

If you have to wipe out your installation of windows and start over it is scary to think you'll have to re-activate windows and potentially be forced into calling Microsoft. Below is a tip where if you copied a file in System32 called wpa.dbl off before you install and then put the file on the new install using safe mode then you're new copy will be activated just like your old copy was.

http://www.online-tech-tips.com/computer-tips/how-to-reactivate-windows/