i have 3 XP Product keys for 3 different systems. i have to rebuild one of the systems but did not label which XP Product key that i used to initially build the systems. what can i do to find which XP Product key goes with each system?
Run the Diagnostic Tool http://go.microsoft.com/fwlink/?linkid=52012 on each computer, click the Copy button then paste the report into Note Pad or any other text program. In the Diagnostic Report, on the 6th line, you will see "Windows Product Key:" It will show the last 15 digits of the product key in that copy of XP.