Windows 7 reinstallation help!!!!!!

I know this is a Mac form put I don't know any pc forms. I downloaded windows 8 consumure preview and I wanted to reinstall window7 so I get my windows 7 disk and hit reinstall. When it was about 70% done and it freezes then it crashes I turn it back on and a loop hole appears and it saids this message
" the computer restarted unexpectedly or encountered an unexpected error. Windows installation cannot proceed. To install windows, click ok to restart the computer, and then restart installation"
I hit ok. It restarts and the same message pops up.

Can any of you help?