In that case.
I would check the Microsoft .NET Framework drivers loaded on your system.
It stated at the Bigpond site.
Minimum System Requirements for Vista. Microsoft .NET 3.0 Framework must be installed.
and WMP11 make sure your system fits this criteria.
If you need to install Microsoft .NET 3.0 Framework you will find it
Here
Scroll down the page to the heading
Instrutions for direct download.
You will need to detrmine if you have 32 or 64Bit Vista for the appropriate download.
32 bit=X86 Redist Package
64 bit=X64 Redist Package
Bryce