Yeah I'm sure.I installed it on my PC at home just fine. It is also running Windows 8 Pro 64-bit. Are you sure your OS is 64 bit? That sounds like an error you get when you try to install a 64 bit program on a 32 bit OS.
Yep, that was it!Make sure it fully downloaded. The first x64 version I downloaded was only 352 bytes. The second one was 92.6mb and installed properly. I'm on win7 though, not 8.