Hi,
1. Which extender player are you referring to?
2. What is the complete error message?
Please provide more information on the issue to assist you further.
Suggestions for asking a question on help forums
http://support.microsoft.com/kb/555375
Meanwhile, I would suggest you to perform a clean boot and check if it helps.
Perform a clean Boot
Follow the steps in the below link to perform clean boot.
http://support.microsoft.com/kb/929135
Note: Once you are done with the clean boot, follow the step 7 in the link to put back your computer to normal mode.
Hope it helps.