Have you guys considered using something like VMware or the Microsoft equivalent? It allows you to "sandbox" multiple XP installations on a single machine. I've got BIAB running under VMware workstation, and it appears to be working fine. However, I have lots of testing yet to do. For example, I haven't tried to MIDI yet.
Provided the hardware interfaces function properly, the advantages of using a virtual machine are many:
1. Very easy to dedicate a "workstation" to a single task.
2. The virtual workstation is portable: I can easily move it from one physical machine to another, depending on where I'm working at the time.
3. The portability makes hardware upgrades very simple. Buy a new PC? Load VMware, then copy over your virtual workstation and you are back up and running.
4. The portability makes disaster recovery a piece of cake too.
I wonder if anyone else has tried this?