winxppro activation?

i never activated my xp pro, how do i check how many days i have left until the activation thing pops up
i've been running this version of windows for i think 1.5-2 years, the activation thing never popped up before

>>7
ok, thanks, i'll believe that it wont pop up, but i have xp pro, and i remember it (if my memory serves) asking me to activate it when i refreshly installed it, but i canceled it