I do not have technical information about your question; based on prior experiences, I have run VisionPoint in computers with no complicated configuration:
Server:
Any Windows Server will be fine. It does not consume large space of you hard disk, unless your company generates thousands of daily transactions.
Workstations:
1. Pentium V and above are fine
2. Windows 2000/XP
3. At least, 1GB RAM memory is fine.
4. 10GB for windows swapping is fine.
That's it. This is a very simple program, no large libraries, no large programs, no large datafiles structures.
I believe last version was developeded in VFP6. If you adquired the source code as well, you can also change it to do whatever you want.