Symantec Antivirus does not scan virus

Click on a file, right-click virus scan would be an error, saying that it is necessary to open Symantec Antivirus, and then click the file, loading services, but can not find “documents” and “service load.” Should be how do

there may be some symantec virus destroyed a number of important documents and services

to repair the installation, so relatively easy re-run the installer.There are restored.
Or unloading, re-SAV.
In any case, there is no serial number, free of charge.
Is nothing more than to restart it several times …