The ePO installer is a complex beast, uninstall through add/remove programs is actually preferred believe it or not.
Still, that does not help you now and i'm afraid from the way it's described the issue is well & truly wedged.
Your best best at this point is to walk through McAfee support article: KB66586 - How to manually remove ePO 4.5 / 4.6
Hi Rob. Thanks for that. I have already done all that. Stripped out the registry, deleted files, etc.
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I'm afraid if you've followed that kb instruction completely it's wedged beyond the ability to clean up.
By all means open a support call but you may be staring in the face of using a different server or an OS rebuild.