I don't know if it is supported, but I would doubt it. Let me check with engineering. I know it is not listed as part of the supported OS's on the Avid website.
Avid is compatible with XP. You can run Xpress pro, the Nitris system at my work is run on a PC, and that makes me think the the adrenaline systems as well can be run on a PC. I would still reccomend the MAC puter if you can afford it. But, the PCs can be a great product, just have to make sure you build it correctly, with every component in perfect harmony with one another.
I just looked at the topic again, i would look at your system resources, and the system requirements for an Avid application.