VHS capture problem

Hi all, I’ve just installed Nero 7 Ultra, using an ATI All-in-Wonder Radeon 7500 card. I’m trying to capture video from a VHS tape and save it to my hard drive. The video previews fine in NeroVision or ATI’s Multimedia Centre, but when I playback the captured video I run into a problem. Generally the first second or so of the video repeats over and over in a jerky motion for the whole length of the recording, but in the top 5% of the video window I can see the rest of the video playing, seemingly behind the repeating section of video. This happens if I capture with Nero or ATI’s software. Any suggestions would be greatly appreciated. I’m new to this and old, so type slowly.