Can't activate my windows!

Hi, I have the genuine copy of windows XP. I formatted my pc yesterday

and now whenever I want to activate my windows using the net it reads,

unable to establish a connection check your connection or try again!


This never happened to me in the past two times, it got activated via the

net in a second. Now, I tried the activation thing maybe around ten times.


Is this has to do with a person that I used my xp cd to format his

computer with my key?


Am I in trouble now? is it going to close after 30 days?


What should I do?