windows media player crashes

I think I've messed up things by installing 3rd party codecs and need help to
resolve this.

Every time I try to play a movie on MP11, it crashes. Details from 'Problem
Reports and Solutions' are pasted below.

I do not know where to look to find what codecs are currently installed and
how to go about uninstalling them and managing them. They do not show up in
'Programs & Features' of in my program files. Is there a list of them
somewhere that you can manage them from.

my OS is vista ultimate.

Product
Windows Media Player

Problem
Stopped working

Date
12/25/2008 6:10 AM

Status
Report Sent

Problem signature
Problem Event Name: APPCRASH
Application Name: wmplayer.exe
Application Version: 11.0.6001.7000
Application Timestamp: 47919356
Fault Module Name: ntdll.dll
Fault Module Version: 6.0.6001.18000
Fault Module Timestamp: 4791a7a6
Exception Code: 80000003
Exception Offset: 00047dfe
OS Version: 6.0.6001.2.1.0.256.1
Locale ID: 1033
Additional Information 1: 9917
Additional Information 2: 45acb337e39147867702f7277eee3550
Additional Information 3: 38d5
Additional Information 4: b6d82655b066afb0165902f9deed7dc3

Extra information about the problem
Bucket ID: 634533159

What are the results of WMP's Help:about:Technical Support Information menu
tool?

--
Speaking for myself only.
See http://zachd.com/pss/pss.html for some helpful WMP info.
This posting is provided "AS IS" with no warranties, and confers no rights.
--
"SH" <SH@discussions.microsoft.com> wrote in message
news:46520BC4-42C9-4AEF-9069-EE53B5691C09@microsoft.com...
>I think I've messed up things by installing 3rd party codecs and need help
>to
> resolve this.
>
> Every time I try to play a movie on MP11, it crashes. Details from
> 'Problem
> Reports and Solutions' are pasted below.
>
> I do not know where to look to find what codecs are currently installed
> and
> how to go about uninstalling them and managing them. They do not show up
> in
> 'Programs & Features' of in my program files. Is there a list of them
> somewhere that you can manage them from.
>
> my OS is vista ultimate.
>
> Product
> Windows Media Player
>
> Problem
> Stopped working
>
> Date
> 12/25/2008 6:10 AM
>
> Status
> Report Sent
>
> Problem signature
> Problem Event Name: APPCRASH
> Application Name: wmplayer.exe
> Application Version: 11.0.6001.7000
> Application Timestamp: 47919356
> Fault Module Name: ntdll.dll
> Fault Module Version: 6.0.6001.18000
> Fault Module Timestamp: 4791a7a6
> Exception Code: 80000003
> Exception Offset: 00047dfe
> OS Version: 6.0.6001.2.1.0.256.1
> Locale ID: 1033
> Additional Information 1: 9917
> Additional Information 2: 45acb337e39147867702f7277eee3550
> Additional Information 3: 38d5
> Additional Information 4: b6d82655b066afb0165902f9deed7dc3
>
> Extra information about the problem
> Bucket ID: 634533159
>