Windows Media Player 11 on Vista x64 does not correctly playback my WMA files. The sound on the files is fine but the actual picture is color distorted badly which makes it impossible to view. Strangely if I run Vista 32bit inside Virtual PC then it can show the very same WMA file! But I don't want to have to copy all my WMA files inside a virtual machine in order to view them!

Any ideas? I have an nVidia 8800GT and am using the latest driver for it and also have all the Vista updates installed.