Windows 7 - BSOD - driver power state failure (Windows 7 does'nt start ater crash)

hello everybody,
I have installed windows 7 six months ago. Original version with regular activation. One month ago, during the shut down action, appeared the BSOD - Driver power state failure. I tried to restart the PC, but, wen the windows 7 logo appeared (before the log-in screen), it stayed more than 7 hours blocked. I decided to install windows 7 again. After 1 month the new installation gav me the same problem. I was able to restart windows and I have upgraded all drivers (mouse and keyboard, graphic card ecc..). Than it was ok for some days. Today I noticed some problem with mouse (Mx revolution, logitech) (I think the mouse is the problem..even before the first crash it had problems). I turned-off the computer and BSOD appeared again. I tried to restart PC but, like the first time, it doesn't start. I can't post the file with the error because i can't log-in into windows 7.

Is there a possibility to start windows 7 without reinstall the OS? I tried the safe-mode with the identical results.

thank you

Andrea

P.S. sorry for my not-well english