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Are you sure they are version 4.6? I have version 4.2 which looks like the latest to me and have no problem connecting my phone to my windows 7 machine in any of the available modes. Did you install them with administrator privileges?
I just had a huge problem where the drivers didn't install for whatever reason in XP and after a minute or two, my computer would completely shut down on its own unexpectedly... I can't figure out why but I installed the V-Cast drivers, it crashed once again, and now it seems to work? Maybe this was the problem you were having as well ripscarface? try getting V-Cast to work and see if it helps

I cant get mine to connect at all on my windows 7 machine.