MMMXIII, welcome to the forum!
I use Virtual PC daily myself. While what I do is not as critical as what you're doing, there's one thing that we both have in common with XP Mode. Not all ports will be recognized by XP Mode, especially if they're being accessed at the same time.
For example, if I were to try to connect both printers at once (one for printing, one to scan documents), it won't go. I don't know why it's like this. It also won't connect 2 USB flash drives at once. There are limitations in the program, some of which I believe are by design. MS prefers that we wean off of XP & move on to a full time Windows 7 install, this is why it doesn't always function as desired.
While XP Mode is a useful feature for many, it's not quite the same as a regular install. Obviously, graphics could be far better, too.
It sounds as though you're a business customer. With that in mind, do what you have to do to get your work done. Your business requires the use of a computer, use what's needed to get by. It's your money on the line here.
One last thought, have you tried to run the vinyl cutter driver in Compatibility Mode? I suspect that you've tried, but thought I'd suggest it anyway.
Best of Luck,
Cat
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