from
http://wer.microsoft.com/responses/R...72496c126#here
If you don't know which program is causing this problem, you can remove ffdshow.ax from the list of installed codecs by unregistering it.
Note: Disabling ffdshow.ax will cause any programs that depend on the codec to stop working or lose functionality.
1. Click Start, point to All Programs, point to Accessories, and then click Command Prompt.
2. At the command prompt, type regsvr32 /u ffdshow.ax, and then press ENTER. ffdshow.ax is now unregistered.