Genuine Microsoft Software

I am receiving a pop-up on my screen frequently which indicates my copy of windows is not genuine. Any advice on fixing this problem for free?
[142 byte] By [Cringo_laura789] at [2008-2-6]
# 2
i am recieving a pop up on my screen frequently which indicates my copy of windows is not genuine. any device on fixing this problem for free?
Anonymous at 2007-8-30 > top of Msdn Tech,Feedback for forums and MSDN websites,Where Is the Forum For...?...