I too, capture with and ADS Pyro AV/Link, and I never had any issues with mine. I even did some captures on my old 2.8ghz pentium. I have done mine on 3 different systems.
One thing I remember, is that the ADS documentation was very specific about the order things needed to be done, in the installation process. There is also a button on the pyro to select how you want to capture (avi or dv-avi), I seem to remember. I'm not at home where I can look at mine.
With mine, I installed the Panasonic DV codec (which came on the ADS CD), and I did all of my captures as DV-AVI. I used multiple softwares for my captures with out problems. You might try things like VirtualVCR, huffyuv, and try doing your capture from "safe mode" or make sure that you shut down things like your firewall and av software, before trying to capture..
If you have download and/or installed a bunch of different codecs, that can cause problems as well.