Original posting was here (http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1291934290
I would like to continue this topic as it has not been solved for me and I think there is a potential issue with the driver for some vista users.
A quick summary,
After following the install instructions for the Arduino driver on a vista (Service pack 1) the install fails.
Logs indicate a problem with dependencies on usbser.sys from mdmcpq.
Similar problems with driver install have been reported within other forums, as mentioned by "Coding Badly" in original post. However the proposed work around didn't work for me.
Further advice is welcome. Thanks