Background Intelligent Transfer Service.

I keep getting the message "Background Intelligent Transfer Service has
stopped working". This stops me using Windows Update and is probably the
answer to quite a few other problems I have. I have gone into services
(services.msc), and started it maunually but it stops within a couple of
seconds.

Anyone got any idea what is stopping it?

I have Vista Home Premium 64 Bit and this service must have worked when I
loaded it as I got all of the 64 bit updates (and no message).

This is driving me crazy!!!