This is when I discover the machine that I purchased only about 2 years ago now was actually 32-bit. Didn't even know they were still making them at that time.
IIRC it bailed out in the first phase before downloading everything, but, still, couldn't the little popup check something as basic as bittedness?
Also IIRC it didn't stop bothering us until I went and did some registry hack or something to make it shut up, as it was just taunting us at that point. But I'm less confident about this aspect of my memory.