A Step Backward???

Three years ago I bought a DAC-100 external video capture device to
mate (firewire) with a then 3 year old Dell desktop running XP Pro
for
the purpose of digitizing old VHS tapes. I must say the DAC-100
worked quite well (virtually no dropped frames) although the
Cyberlink
PowerDirector software was so painful to use I stopped before I could
finish capturing and editing all the tapes. I recently purchased a
Systemax Intel quad (Q6600) desktop running XP Pro and a copy of
Adobe
Premier Elements 3.0. I've been using this new system to capture
video from my DV camcorder with pretty good success. When I decided
to connect the DAC-100 to the new system to resume capturing the old
VHS video, the results were extremely poor. The PC kept losing and
regaining the DAC-100 and when it could maintain the connection the
video capture was pathetic (more than half the frames were getting
dropped). I expermented with the dip switches in the back of the DAC
with no improvement and ended up restoring the original settings (for
XP). I'm wondering if my new PC is too high powered for the DAC or
is
there a setting somewhere I need to fix. I see that the DAC-100 has
been replaced by a DAC-200 whose improvments have nothing to do with
new OSs or higher powered PCs so I'm not inclined to buy that newer
model.
If anyone has any ideas as to what could be causing my problem, I
sure
would appreciate hearing them. I hate to spend another $200 for a
new
video capture device when there's no way to know if will work any
better with this new PC.
Thanks.
Terry