I suspect you'll will have to integrate
this hotfix into your base image before you can install the 64-bit versions of these operating systems, but it is doable.
You might be wondering - why bother with 64-bit on a low powered VIA CPU? Tiny media center PCs stuffed with a lot of RAM come to mind. I am a big fan of 64-bit, ever since AMD came out with the instruction set and Exchange 2007 went 64-bit only for production.