As Windows Vista is still a very new operating system, Microsoft are encountering bugs and glitches along the way. We can assure you that our Tech Team constantly endeavour to be up to date with current issues, and to assist you in assisting us, we have included a direct link to the Microsoft Media Troubleshooting Area for Windows Vista & WMP 11.
http://support.microsoft.com/gp/tshoot_wmp11_more
Here is also the link to the Home Page for WMP 11 for Windows Vista
http://www.microsoft.com/windows/windowsmedia/player/windowsvista/default.aspx