If you lost your windowskey here is a tip how you can recover them.
This tip will work only if your original os still working.
1. Click Start -> Run type regedit -> OK
2. Double - click HKEY_LOCAL_MACHINE.
3. double click SOFTWARE
4. Double click Microsoft
5. Double click Windows (in windows XP, double click Windows NT instead).
6. Click Current Version
7. in the right-hand pane, look for the item named Product key. The value you see there is your windows cd key.
The only one I see is Product ID which is the same one
you see when you Right Click on My Computer and select
properties. The Magic Jelly Bean Keyfinder is what most
people are using to see there product keys of the installed
rock xp is bs i needed a cd key and my friend downlaoded rock xp and it said ur xp cd key and he gave it 2 me then when i entert it it was wrong rockxp just guesses fake numbers and says tahts ur cd key itS BS
RockXP allows you to retrieve your XP product key that you used when you installed Windows XP, as well as keys for other Microsoft products. This can come very handy if you need to reinstall but have misplaced or lost the CD cover with the serial sticker. In addition, the program also lets you save the product activation to a file, and enables you to recover usernames and passwords contained in the Windows Secure Storage.