Hey folks. I've had Windows 7 ultimate 64bit (retail) for about 7-8 months now. Just recently put together a new computer rig a few weeks ago and lately, its been notifying me to re-activate my windows 7 for some reason. And when I type in my key, it says "The product key you typed cannot be used to activate windows on this computer." FYI, it isn't an OEM hence it worked perfectly on my previous computer. I haven't had much time to troubleshoot so I always ignore the notification and everything seems to work fine so far. Although, I'm afraid its gonna be a problem pretty soon if its asking me to reactivate. Anyone have any ideas? I guess my last resort would be to call microsoft.