Disable Activate Windows XP Prompts

Hello everyone!
I'm using Windows XP on my Aspire One, and recently re-installed it, and was wondering, do you guys know how to disable the activation prompt? (I believe there's a regedit way to do it) Currently I boot into safe mode, but I'd like to do more than just the basics with it.

Any help would be appriciated,
- Moose
just look for a key to activate it there are plenty of them about now,most of them work ,or just download a new copy with a fully updated sp3 or 4 wont have to do all the updates then