[majk_tajsam]

If it's AVI, see what GSpot (http://www.headbands.com/gspot) says (or download AVI FourCC Changer (http://www.divx-digest.com/software/avifourcc.html) and check FourCC (http://www.fourcc.org/codecs.php)).

Check File->Properties in WMP:



You may need:
-Windows Media 9 Series Codec:
http://www.microsoft.com/downloads/d...displaylang=en
(or http://www.microsoft.com/downloads/d...displaylang=en)
and
http://www.microsoft.com/downloads/d...displaylang=en

OR

-Windows Media 8 Series Codec:
http://www.microsoft.com/downloads/d...displaylang=en

OR

Originally Posted by adicoto

Try to install ASF indexer...
wmtools.exe
and
WMFDist.exe

OR...