OK so i bought the WIN XP Pro upgrade and need to install it on 4 computers. After installing it on the first i tell it to do the online activation...no problem. I install it on the second computer and tell it to do the online activation....a minuet later it gives me a message that says the activation limit for the product key has been exceeded. WTF !? i just paid $150 to install this on one computer ?? Without having to shell out more money to microsoft are there ways to keep XP runnning (it says after 30 days it will expire, ) ?