It all happend overnight, i did not do anything. Can't boot to win 7 - freezes at animation.Can't boot to safe mode - freezes at classpnp.sys.If i boot to win 7, it takes me to startup repair, but it doesen't do anything, it tells me:ROOT CAUSE FOUND: Unknown bugcheck: Bugcheck 9f. Parameters = 0x3 .....Any fix for it or any idea how can I backup stuff from my current C: and reinstall windows? I tried Win XPE but it won't recognize HDD.. (imo so doesn't win 7) tho BIOS shows hdd + UBCD can do tests with hdd.I've searched google but there is no solution for this yet.I have fujitsu siemens e8210 with intel stuff laptop running win 7 build 7227.

Sorry, but this forum does not offer support for the unauthorized build installed on your computer (win 7 build 7227).I would recommend reformatting your hard drive and installing the Windows operating system that originally came with it.When Windows 7 is offically released on October 22nd, you can purchase it and then upgrade.Carey Frisch

what does it mean unauthorized build?

He means that the build you acknowledged running here is not authorized to be run outside of Microsoft.Renee

what does it mean unauthorized build? Please see: Windows 7 Official Support Forum PoliciesCarey Frisch