Hi Neal,
I think you have made a good choice by installing both operating systems. Virtual PC 2007 has not been fully tested with National Instruments DAQ boards so I cannot advise you whether the boards will function and if there are any incompatibility issues.
I am curious however why you want to work with XP and Vista together? Is there anything preventing you from working with just one of the two operating systems on a given PC?
Regards,
Jennifer O.
Applications Engineer
National Instruments