problem after upgrading to windows 7

I downloaded the Windows 7 RTM from MSDN, and after upgrading from vista, something comes up, like keyboard language,I press English, then a list of things come up like device manager, system restore, and all of that. Then i go to device repair, and says i plugged in a device, and there is an error code. I had to reinstall vista again. I couldn't go back to the log in page.

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