On Nero Vision 5 Whenever I click "Add Video Files" Button on the Video-DVD Creation it freezes

On Nero Vision 5 Whenever I click “Add Video Files” Button on the Video-DVD Creation it freezes. It doesn’t open up the next window which contains the ability to browse and add video files. Instead it doesn’t respond and freeze. I’ve tried waiting for 15 mins but sitll is frozen. On some days it works fine.

If anybody know how I can remedy this it’ll be well appreciated.