OK.sorted i found the answer in the troubleshooting page.
"peter c.a.hawkins" wrote:
> I have just reinstalled vista home premium and now in wmp11 none of the songs
> or video which comes with the player will work.
> i get the pop up box stating:-cannot play the file,might not support the
> file type or the codec used to compress it.
> Help someone please.!!!!