When I boot my pc it freezes forever at CLASSPNP.SYS loading.  (  I don't remember how I did it  but I managed to get a kind of boot log on a screen)   I have to push  reset button again and again and suddenly after  several times and an hour later  it goes ok and everything looks fine. That's all the same with the safe mode too.  Had this problem a few days ago and it appeared  today again.  Now I am afraid to reboot my pc. Is it possible to fix it somehow?