I have had windows 7 installed on my PC for over a year now with multiple fresh installations and no problems.Lately I have been experiencing difficulties with my windows. In the past 5 months though, I've had to re-install windows as for the third time now, my PC starts hanging soon after start up. It's not due to any process; also, it doesn't happen in safe mode. This time, the problem reoccurred within 3-4 days of a fresh installation.It hangs a couple of times and eventually starts showing a repair due to winload.exe fail error...windows restarts after the login screen automatically. Now safe mode or repair panel also doesn't work, it restarts in between. As I tried to install it this time, i booted from the installation pen drive which I've used before, with a setup I've run before. Upon booting from pen drive, it shows windows loading files bar....but right after that, after the windows 7 logo appears for a couple of seconds, it ends up displaying the cursor only and rest of the screen is gray/black. This happens every time i try to run windows installation. * I have no HDMI cables connecting my monitor, nor any other display devices. * I've tried resetting the BIOS to no avail. * I've used an Nvidia 8600gt card for about 5 years without such black screen problems, then again it is 5 years old. * Right before windows stopped working, I uninstalled my nvidia drivers manually to see if wrong drivers were the issue, pc still hung up. Any and all help will be appreciated so much! Thankyou!