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Olly is a debugger, and most protected wrapped executables will notice it running and either give your debugger a hard time by crashing the game or give you scrambled assembly.
I know its nice for breakpoints etc and tracing, but ideally you would need an unwrapped executable or somehow remote debug it.
Still Cheat Engine has a handy debugger of sorts, not good like olly but at least you can get somewhere with it.
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