First we need a lot more info from you re: what you are using for

Computer
OS
WMP version
any other players installed
what codec pack you are now referring to

etc., etc.

In the meantime, and at no real risk of screwing anything up...

Try Nimo Codecs which you can find by clicking on the same link in my sig below...

If you do try it... Choose Build 8
Read the instructions carefully...
The easiest way to install it is to choose a Custom Install and then select All...
THEN make a careful check that you have unselected the 4 files about which you are warned...

Bet everything plays after that !!!

Well, hope so !

__________________
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Tomorrow's forecast:
Sunni in places, Shi'ite in others...