Don't worry, it's just the icon that's changed. Sometimes they seem to change back to the LW default... don't know why! Just make sure your default players for video & music are what they should be, if they've changed then you can change them back again! Confused yet? Here's how
http://www.gnutellaforums.com/showth...%3E#post163057

Once you've done that, the icons should look normal again!