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When taking your Aux. Output from your VCR and plugging it into your line in on your soundcard, make sure that the cable is good quality, stereo as opposed to mono (if you're using extentions), and...

You might be running low on ram, but a couple other things come to mind...

You might also want to set your virtual memory in windows to a constant (say, 256 megs) rather than "let windows control...