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Sorry that you're in such a mess.
The only thing I could think of is trying a previous restore point, before you messed up the registry, and then when it reboots quickly switch the monitor cable from the mb to the graphics card. I don't think you'll be able to install radeon drivers without a radeon card hooked up, so I'd try that first.
If that doesn't work, you might have to do a fresh reinstall of windows. I would back up anything important first.