I've also tried to install Visual C++ 2008 for 64 bit. But it failed. It said Error 1905 and "HRESULT: 0x80070002" as installing the photosynth. I have to say, this Photosynth is very helpful tool for me as a geoscientist. We do take a lot of picture when we're on the field and we try to show the condition of the field at a small class room. Perhaps, the photosynth will help me a lot at my presentation, I will use this program to help me finishing my thesis.
So, Natelawrence, just let me know if you already have photosynth for 64bit. I do thank a lot.