I have 3 windows 7. None of them works.

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Sep 30, 2014
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Hello, I just installed windows 7 on my laptop and it corrupted during installing. I did it a second time and the same thing happened. The third time, and the same thing happened. Now I have 3 boot options and all of them says windows 7. Every boot option crashes. Any way to clean off hdd without going into an os?