You have several options:
1) A firewire card, pretty cheap...but you need firewire output on your source..and VHS doesn't
You could however borrow someone's DV cam that has analogue inputs on it, thus using the camera as a D/A converting and giving your computer a nice striaght digital feed to work with.
2) A cheap analogue capture card. Most don't have hardware compression...which is a good thing these days cuz CPUs can more than handle the compression...and you can use lossless codecs like HuffyUV. Go with he brooktree/connextant chipset.
3) Trade in your card and get a VIVO version. Vivo is mucho nice
The hardware is the cheaper part these days, the editing software is the pincher. I recommend Vegas Video 5.
Hope that helps.