Vista - Compro VideoMate U2800F-error-(5004:0x80041f42) help

Hi folks,
Just got this USB DVB tuner stick and I can't get it to do anything.
I followed the install instruction ie stop Windows searching for drivers and install from the disk and it won't. I get an error message as above.
Tried this a few times uninstalling it etc. Nothing.
I then just connected it up and let Windows try to install drivers. This claimed to be successful but wasn't. I couldn't open it from the control bar or the start menu.
I opened Media Center but could'nt find it there either.
I went to Compro's site and downloaded the latest 64 bit drivers. Wouldn't install with the same error message.
I then noticed one of those little explanation marks on my shutdown button that mean updates are ready.
So I shutdown and restarted and it was a Compro update. Once again failed to install with same error.
Anyone got any ideas.
Thanks, John