I have 7 computers and 1 licensed windows xp. Every 30 days I have to reinstall xp on a few of them. Is there any cracks that actually work? I noticed on one of the computers the CMOS battery is dying and the 30 days on that computer appeared to be extended - I could be mistaken about this with 7 computers to keep track of. However, I took the CMOS battery out of 2 other computers, 1 pentium II gateway desktop and 1 pentium III thinkpad 1300 notebook, and they still function normally as if the battery is not removed. Is there a way to extend the 30 days by messing with the battery?