I had the Windows 7 freeze up on boot for two days. I was so frustrated. It worked beautifully for two weeks straight from the manufacturer, then the dreaded windows update popped up and installed KB976325 and KB890830 and everything started locking up. The boot up would take 5 minutes so I decided to reinstall the OS. That didn't go well and was hanging anywhere from the first sign of windows, to the color logo and even booting from DVD when loading files. Nothing would work and then I read that someone mentioned possible video card conflicts or Sata conflicts. So I unplugged everything from the laptop, pulled out the battery, and the extra SATA hard drives and reinstalled again on a new partition and finally it worked and loaded up like a standard build. After installing all the drivers and windows updates (minus the ones listed above), I reinstalled the sata drives and battery and it worked well ...so far. I must mention I have dual nVidia graphics cards and was ready to remove them as a last resort to load the OS but luckily didn't have to. Hope this helps someone.