I have my PC for 2.5 years now. The problem first appeared a week ago when i deleted Norton, the message " your version of Windows is not genuine " kept popping up.(I purchased the genuine version of windows 7). I used SLMGR -REARM to get rid of the error message and the black screen that came with it. But, now a new message keeps appearing (windows could not activate). Is there any way i can activate my windows using the original key i had? I can't find my box that contained the cd of windows 7.