Hi David,
You'll have to remind me which version of the software you currently have installed. Are you using the 'new' or 'old' drivers? If you're using the 'new' drivers, then I'd say go ahead and upgrade, there's nothing new in there that would stop it from working. If you're using the old drivers, I'd be a bit more cautious. That being said, it should work on XP, but the only problem is we don't have an XP machine here and it would be very difficult to fix any problems that occur.
I hope that helps.
Chris.