Vista Ultimate x64 + Dektop Icons - Double Click Issue

A few days ago I installed Windows Vista Ultimate x64 and Directory Opus.

Everytime I double click on an icon on the desktop to open an application it opens Directory Opus instead. I have to manually right click on the icon and select "open" to run it.

Any ideas how this can be fixed?

Currently all you can do is turn off the double-click on desktop option.