Why won't windows media player play videos or load video library? It plays audio files. Can you help please?

Here is the error detail report:

Problem signature:

Problem Event Name: APPCRASH

Application Name: wmplayer.exe

Application Version: 11.0.6002.18111

Application Timestamp: 4aa91411

Fault Module Name: fun_avcodec.dll

Fault Module Version: 0.0.0.0

Fault Module Timestamp: 441fa1ef

Exception Code: c0000005

Exception Offset: 000a6462

OS Version: 6.0.6002.2.2.0.768.3

Locale ID:

Additional Information 1: 8445

Additional Information 2: de8b25fcfa6dea85e8bf1c5efbe860d3

Additional Information 3: 0960

Additional Information 4: 67720dec4b80b489bf42f8ba83cd58c2