I'm having a similar issue with the starcraft anthology installer, which I tried after I had problems installing from disc. Very confused here, I've used the same discs and installer numerous times on my other computer with windows 7 with no issues....both are 64 bit.
Never mind anything I said. I found my old install disks and installed/patched it with absolutely no problem. All is good. However, if anybody figures out why, I'd like to know just for the sake of my curiosity.