STEP 1: Open Symantec Endpoint Protection by going to Start -> All Programs -> Symantec Endpoint Protection -> Symantec Endpoint Protection.
STEP 2: Click Scan for threats.
STEP 3: Click Run Full Scan or Run Active Scan.
NOTE: Active scans run quicker than full scans. However, active scans are not as thorough as full scans. It is recommended that you run a full scan on your computer regularly. Full scans can take over 2 hours to complete so it is often best to run a full scan overnight.
STEP 4: Wait for the scan to complete. When the scan is complete click Remove Risks Now to remove any listed viruses.
NOTE: Symantec will remove any viruses found in the scan. You may need to reboot the computer to complete the removal of all viruses. It is recommended that you run the scan again to confirm that the viruses have been removed.