Q: Windows 7 partition using boot camp assistant not starting up. What do I do?

I have installed a windows 7 partition using boot camp assistant but whenever it actually starts up I get a "windows error recovery" screen. No matter what I do from that point I then get the "windows boot manager" screen. From this point I am ultimately unable to get Windows to actually start up in any way. The screen says my status is "0xc0000428" and it says  "windows cannot verify the digital signature for this file." What do I do or what have I done wrong?