This is bullshit, I can't even play, I've installed it with Steam, then the non-steam Humble Bundle one, and even pirated it, so it must be a problem with the registry, If I could just find the registry file and erase every trace of Super Meat Boy it would work fine.
I don't think it's a registry error. I used CCleaner to clean my registry after uninstalling the game, didn't work after I reinstalled it. You can always try it yourself though. http://www.piriform.com/ccleaner