Movie Preview
 

When I attempt to activate "Preview", on a movie being downloaded, I get an "Advice" from Windows Media Player, saying "You don't have the necessary CODEC, to play this file".
Is there a process for adding all the appropriate CODECS.

If you are using XP try this codec pac, it's very good and free...
Download XP Codec Pack 2.0.7.1 - XP Codec Pack is one of the most complete codec pack

If you are using Vista, try this one...
Vista Codec Package v4.4.5 (freeware)

Movie Preview
 

THANKS
That worked just great