Sounds that that installer has grabbed a lot of file extensions and made them open in a media player.

You can try to uninstall this codec pack to see if that reverts those associations to their previous action. Otherwise you can try to right-click a file with a changed association and use open with to change the current association to the previous program that handled it.

It also changed the uninstaller to open in the media player and I can't open with with firefox

And most of my programs to open in the player and when i tried to re download the Codec Pack to get the uninstaller it downloaded to be opened in the media player

You may need help from a Windows forum to remove the association in the registry between EXE files and the player. For example:

http://windowssecrets.com/forums/

Or if we assume it's malware, our support article lists some specialist forums for cleaning up infections: Troubleshoot Firefox issues caused by malware.