I keep restoring to my Windows 7 factory software/settings, because after a while, when I try to restart it goes to a blue screen, then the monitor show "no signal" and goes dark, never to boot Win7 on it's own.
I use the startup repair program, with no results, and try a restore point, with the same problem.
So, I restore the computer to orig settings/software and start again, with the same no start problem, after a few successful reboots.