ATI capture driver, picture freezes for a moment

I have a new PC (3.2GHz, XP) with Asus Extreme AX700PRO/TVD (PCIe)
card. So far I had ATI All-in-Wonder 128 and often used Multimedia
Center mainly for capturing photos from movies on VHS tapes. First I
couldn't run the MMC in my new PC at all. They say the ViVo cards and
MMC are not supported by ATI . I had to use this:
http://www.videocard-forum.com/ati/Got_ ... 00337.html.

There's something wrong with capture driver. As if the picture in
window was somewhat preprocessed (by some software filter?). It is
seen while rewinding VHS (connected via composite input) or in rapid
or noisy scenes - picture stops at that moment. I think the problem
lies in capture driver - VirtualDub does the same as MMC. VHS tapes
are problematic. If they don't hold their position on VCR head
correctly, then while VCR quicky corrects the tape position, the MMC
picture freezes for a while. Rewinding does the same - whenever the
noisy lines appear in signal, MMC picture visibly freezes. The old MMC
(7.1 + respective driver) had the window content pefectly identical
with picure sended from VCR to TV, no stops...

I tried both the latest catalyst or original Asus drivers. No change.

Any ideas what's wrong? Thanks.