I have installed Windows 7 Ultimate a week ago. Yesterday I've noticed that the SP1 update is available. After installation of SP1 the computer failed to startup, and had shown a black screen. I couldn't even go to safe mode and F8 didn't help.

After some fixing attempts including system restore, startup repair, bootmgr & BCD rebuilding from CMD, I have decided to reinstall Windows (after all, it's only a week old)

After the successful installation, I have decided to first install all available updates before I continue. So after the updates download & installation, the computer rebooted. And now I didn't see the black screen again - but in the "Starting Windows..." screen the logo didn't appear and the system didn't startup. Here I could go to safe mode selection window, but it didn't work either ("Loading Windows Files" but nothing).

I've also tried:

• I thought that the CD was corrupted, so I've used a fresh new disk of Windows, tried x86 & x64 versions, the same symptoms, no change.
• Resetted the BIOS to default, no change.
• Memory diagnostic
• HDD diagnostic
• Restarted Windows WITHOUT INSTALLING UPDATES, but it had the same symptom, so maybe Windows Update is not the case?!

I've tried installing it so many times - that I am simply stuck - I can't "reinstall Windows, because it is corrupted...". Maybe the HDD is corrupted? I've also checked it and didn't find a problem.