Backdoor.Pihar need solution

Hi

My machine is infected with Backdoor.Pihar. I am getting below security log every hour. Please help.

[SID: 27101] System Infected: Backdoor.Pihar Activity detected.
Traffic has been blocked from this application: C:\Windows\System32\svchost.exe

My machine is using Symantec Endpoint Protection-Ver 11.0.5002.333

Regards

Vishal