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

If you use Internet Explorer, you don't need to worry about the 30 day period. After 25 days, you'll be so fucked up and covered in malware that you'll need to reformat.