Hello,
What version of Symantec Endpoint Protection are you running?
Make sure you are running the Latest version of either Symantec Endpoint Protection 11.0.7300 OR Symantec Endpoint Protection 12.1.3001
Have you created any exceptions in the Symantec Endpoint Protection for Pcounter?
Creating exceptions for Symantec Endpoint Protection
http://www.symantec.com/docs/HOWTO80919
How to create an Application Exception in Symantec Endpoint Protection 12.1
http://www.symantec.com/docs/TECH203266
Creating Application Control Exclusions in Symantec Endpoint Protection 12.1
https://www-secure.symantec.com/connect/articles/crreating-application-control-exclusions-symantec-endpoint-protection-121
Hope that helps!!