Windows 7 help please!!!

Hello, I'm hoping someone can help me. I have a custom built pc( by a friend) has quad core phenom processor 4gb ram. Gigabyte motherboard 500gb hard drive with windows 8 preview installed. And a formatted 250gb. I'm trying to install windows 7 on the formatted drive but everytime off cd hangs on expanding files. So I thought I'd try USB stick. Got a 16gb cruzer blade. Formatted and made bootable. Windows on it. Will start via my computer but whenever I try booting it on standup I get an error about not being digitally signed. I've tried numerous things but will not boot from USB. Anyone know how to resolve this? Any help is help. Cheers. Ryan
2 answers Last reply
More about windows please
  1. Uhh did you buy your copy of windows from a store? If the dvd is bad, take it back to them.
  2. It's a copy of a genuine disc. I've used it on ther computers fine. Even on this computer My mate built it 4 me. Brand new he worked at novatech at the time. I just can't understand why it won't boot my USB stick
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