Mario,
When I had a V-link in my system, using a Mac, it would output 96khz if not "told otherwise". I don't know if the same is true for a PC. However, if your DAC is limited to incoming signals at 41/48khz, this could be the problem. I am sure someone else could tell you how to restrict or not upsample the signal from the v-link in windows, if this is the problem.
Cheers,
Soren