I installed windows xp a month ago and I activated it. Now it has locked me out, 30 days later, saying windows needs to be activated "to activate now click yes" when i click yes, the activation box comes up and says "windows has already been activated" "click ok to continue". i click ok and it logs me off. And this becomes a vicious cycle if you can see where i'm going with this. What could be causing this?j why is it asking me to activate then telling me it's already activated and not letting me log in?