Canopus ADVC 50 capture problem

[colojim]

Having had frame drops on old VHS tapes I bought the above Canopus card and installed it.
Does not work in Win XP SP1.
Booted into Win2000.
Yes it captures but when I monitor the video without capturing or with capturing I get jerky picture, short freezes and the sound momentarily distorts or almost cuts out.
THis is installed into a Pentium 4 with 3ghz, dual channel 400MHz FSB and plenty of hard disk available.
I am feeding the 1394 cable into the 1394 input port on the back of an ASUS P4P800 deluxe Motherboard.
What is wrong?
All I have done so far is replace dropped frames with picture freezes and sound problems.
Video comes from a JVCHR-XVS20 with S video output.
When I switch back to the Winfast A310 card with the input from the VCR the monitored picture is again smooth with no sound problems, so it is something to do with the Canopus?
Comments much appreciated.

[Will Hay]

I've had no issues with my ADVC-100 and WinXP SP1 but if this is your problem then there's a peice on it over at the Canopus forum.
Will