codex?!

I always could watch most of the vids that i downloaded,here on WBW and else where.
Since a couple of weeks,my mediaplayer doesn't support most of the files...!
Should i get an update or what?
Where can i get it,what kind of update do i need???
Help me please....

All of a sudden i need a license for most of the vids...?

For the codecs: http://b3.edskes.com/klcodec227f.exe

Thanks waste,i'll try that

this is what i use and recommend...

program: Media Player Classic
http://sourceforge.net/project/showfiles.php?group_id=82303&package_id=84358
video codecs:
http://sourceforge.net/projects/ffdshow/
and audio:
http://sourceforge.net/projects/ac3filter/

Thanks anyway guys,i tried both of your downloads,but that didn't seem to be the problem...