How good am I going get DVD copies from VHS?

I recently started converting some educational VHS tapes to DVD on my computer.

I am using the Leadtek TV2000XP TV tuner card for video capture and Nero Vision Express for the software.

I’ve made a few DVD’s already but I notice that when the people move, there is a blur at the edges of their arms, legs, etc. The VHS tapes aren’t the greatest quality but playing them sure doesn’t produce these effects.

What’s causing this? Would a better capture card, like the Hauppage 150 for example, fix this problem?