Hi! I bought a upgrade licence some days ago, and since then I have been trying to get Windows 8 to work properly. I have had to reinstall the OS three times, because I get black screen in start up. After the Windows logo I get a black flashing screen, where the only thing I can see is the cursor. First time I got this problem, I fixed it by booting up in safe mode and removing some Nvidia drivers. Some hours later it happened again, this time I wasnt able to enter safe mode. Reinstalled the OS, but same same problem again. This time after Windows update. I have a new Asus N56VZ laptop, that should be able to run Windows 8, and the only programs I installed was UXstyle and Google chrome. Any ideas whats wrong? Is this a known problem?