You might want to give us a bit more info like, are you talking VHS to digital?
Also what method were you intending to use to get it from whatever media you're talking about to your PC....an add in card or...??
If it is what I think it is your saying, converting VHS to DVD then I would recommend a stand alone DVD-VHS player/recorder. I've done a little of this with a TV Card that had a composite input.
Just know it's a real time transfer....a 4 hour VHS will take 4 hours to copy but, you probably already know this.