Hello, I'm wondering if any of you have any bright ideas regarding the following problem...

I have a ATI All-In-Wonder Radeon 7500, and I've had it for over a year now. Never any audio sync problems capturing either MPEG-2 in MMC (7.5) or AVI in VirtualDub. But about a week ago, without ANY changes in configuration (no new drivers, software of any kind) the audio started going out of sync when capturing AVI in VirtualDub. It is only about half a second but still noticable and very annoying. And it doesnt seem to matter if it drops frames or not. Nor does it seem to matter if it adjusts the audio/video timing or not. It is always about half a second out of sync, no more no less... And I have seriously tried everything short of reinstalling Windows so... any ideas...?