Please help with workflow..and products needed
 

I need to shoot a presentor - who is in front of a computer monitor. He will talk about the software appliation running on the computer.

I need to capture the screen close up the whole time he is talking so i can edit screeen shots and syncronized mouse movements later.

I tried a cheap scan converter once and it was lame. I have shot the screen before but it uses up a camera and is not convinient.
Any scan coverters that really work or other creative sugestions?

Yes, try shooting a LCD screen. They don't have bars running through the image. Plasma screens are good too.