Rofl, I suspect that is the black screen of death you get when you've killed the boot sector and you're stuck at the boot up screen failing to get into windows.
My mother asked the same question. She read somewhere that you can move the boot files to the drive you wanted and tell it to use that to do its work instead of the old location. But, seeing as I had no personal idea how it worked she went the safest route and just reinstalled Windows 7 rofl.
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