This might seem like an odd question

However here goes:

I have a computer that has two network cards(I'll call them A and B).

I'd like card A to only be used for the physical(host) computer, and card B to only be used for the virtual machines.

Now I know how to make it so the VM's run bridged(or whatever) off one nic, however how can I tell windows(xp pro) to only use card A for the internet and networking services etc.

Does that make sense?

Cheers!