Solution 1: Use standard uninstall function to remove Symantec.

Step 1: Boot your PC in safe mode, don’t know how to? Click here.
Step 2: Run Perfect Uninstaller. Click here if you don’t have one.
Step 3: Find the Symantec product you want to uninstall in the applicaton list of the main panel. Select it and click on the Uninstall button at the bottom of the window.
Step 4: Click Next and follow a few onscreen instructions to complete two or three steps.
Step 5: Restarting your computer is required to complete removal.

Solution 2: If the standard uninstall function failed, your Anti-Virus installation may be damaged. You can use Force Uninstall instead to completely remove all elements of Symantec product from your computer.

Step 1: Getting into safe mode is required, too.
Step 2: Run Perfect Uninstaller and click Force Uninstall at the top of the main panel to open Force Uninstall Wizard.
Step 3: Locate the program and/or its installed directory to make a Force Uninstall. Usually Symantec products are installed in the following folders:
C:\Program Files\Norton XXX
C:\Program Files\Symantec
C:\Program Files\Common Files\Symantec Shared
Step 4: Click Next and follow a few onscreen instructions to complete two or three steps.
Step 5: Restarting your computer is required to complete removal.