Hello, so recently i reformat my whole cpu and i installed windows 7 ultimate. After i finished installing windows 7 i went to install my graphics card driver which was Nvidia. After succesfully installing and having latest updates they asked me to restart my computer so that everything will be in place. After i restart it will not boot up the windows, that means after the windows icon appear my screen goes blank. Can someone help me? I've been reformatting my computer so many times because this happens repeatedly and by repeatedly i mean every time after i install my graphics driver and restarting the computer, it wont boot up. Please help me. Thank you