tethered shooting 1d mark 2n, software , drivers

I have a laptp that I have had mixed results shooting tethered to my VISTA os laptop.

I open LR2.7, the EOS utility and after fiddling with a few boxes the program will work tethered.

When I plug the firewire in the window says the WIA document SCANNER drivers cannot be found-I just cancel that window.

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The issue is the process is not dependable and is suicide on a photoshoot. Some times it works and is a very powerful tool! Other times.....

I called Canon. they told me that if it was working NOT to update the EOS Utility program.

WIA or WIC drivers, which should I use?

Does anyone use this setup?

Shooting tethered is the way to go!!!