I don't know of an easy fix for your problem. Once you're locked out, you're locked out -- as designed. I do recommend that you reinstall Windows. But, since this is a computer that you're using for training and experimentation, make a disk image of the computer after you've installed and configured it. Then, you can safely experiment without being afraid of leaving yourself locked out. Try Symantec Ghost -- it's my favorite disk imaging product, but there are plenty others available.
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