Last night I upgraded my Windows 7 64 bit Pro OS to Windows 8 Pro 64 bit OS. I followed all of the instructions and it worked. The system stated that I needed to upgrade my Norton 360 and that the upgrade was available. I did the upgrade and now when I attempt to start Windows 8 my monitors just cycle on and off and I never get to a desktop. I tried to boot up in safe mode but it did not work when I hit the F8 key. Is it different in Windows 8 to boot into safe mode? Please advise. Thanks!