Hi,
You can also consider following steps if you dont want to add each and every file for Exceptions manually.
http://www.symantec.com/business/support/index?page=content&id=HOWTO54867
To create exceptions from log events in Symantec Endpoint Protection Manager
On the Monitors tab, click the Logs tab.
In the Log type drop-down list, select the Risk log, SONAR log, or Application and Device Control log.
Click View Log.
Next to Time range, select the time interval to filter the log.
Select the entry or entries for which you want to create an exception.
Next to Action, select the type of exception that you want to create.
The exception type that you select must be valid for the item or items that you selected.
Click Apply.
In the dialog box, remove any items that you do not want to include in the exception.
For security risks, check Log when the security risk is detected if you want Symantec Endpoint Protection Small Business Edition to log the detection.
Select all of the Exceptions policies that should use the exception.
Click OK