Video capture can be very hit and miss depending on your capture card, system configuration and software choice. The two links I am giving you should lead you to all the info you will ever need to produce perfect video capture everytime.
www.vcdhelp.com and
www.doom9.org
check out the reviews under "capture cards" you will see that many cards do not produce the advertised results. If you are looking for a cheap card though check out this deal
At officemax.com
Avermedia DVD EZMaker PCI
FREE after rebates - deal expires 12/6/03
http://www.officemax.com/max/solutio...3&moreInfo=yes
It gets decent reviews too.