Planetdance is only x86, and the dll's are fine.
But there's obviously something that messes things up there. By the way you sound, i'm not very optimistic about your pc, maybe there's memory faulty or something, but i don't get reports from others telling that everything gives errors.
What you can do is be precise, tell me exactly which module gives a runtime error and on what line, that might give me a clue but as said, i'm not optimistic, i've seen bad pc's before and this just smells like one.
my advice: try another pc.