The Roland VSC VST/DXi that we include with Band-in-a-Box won't install on the newer 64 bit OS's from Microsoft. That' been a long standing issue.
I recall hearing from a customer that they were able to get it working, but they couldn't recall the details of if/how it was really working.
So I am wondering, has anyone has managed to get the Sound Canvas soft synths installed on 64-bit OS's.
Perhaps by upgrading the OS, where the synth is already instaed?
Also, the same question would apply to the TTS version of that (from Cakewalk). Have you got that working in 64 bit?
Windows 7 comes in both 64 and 32 bit versions (included on the same disk). But it looks like they are pre-installing 64 bit as the default, so most people are going to have that.