In case anyone is still considering using DV.now AV, ran into an issue this winter. Suddently it became unrelaible on my Athlon 64 system running Win2K that had worked previously. Turns out it was the videeo card. I had replaced an ATI Redeon 9600 card with an ATI Radeon X1600Pro. Although the DV.now AV driver would install, I would get a hardware not working/not found errors from Fast Forward. Changing slots did not help. Going back to the Radeon 9600 appears to have resolved the problem.
I wonder if this is the basis for issues some people are having with WinXP machines - they are using a new computer with a new videoc ard?