Vista - Upgraded VPC

I installed the SP3 for WinXP and the related upgrades for VPC and VS. The
VPC, and the VM in VS are DOS VMs. The VMs run a program that is capable of
accessing DOS from the application. I use this "access to DOS" to run a
translator from time to time. Prior to the upgrade the translator in the VMs
ran at a index of (say) 10. In the upgraded VPC, the translator runs at 10,
but in the VS VMs, the translator runs at a reduced indedx of 1 or 2.

Any ideas, insight, suggestions, or solutions?
--
Wesley