You do not need to do anything. This is a Norton Product Tamper Protection event, and is normal and harmless. Legitimate programs like RoboForm often attempt to access Norton files and processes. All such efforts are blocked in order to prevent Norton's operations from being disrupted or compromised by any outside agent, legitimate or malicious. These do not pose any danger, and Norton is simply logging the events. The outside programs are only prevented from interfering with Norton, and are otherwise allowed to run normally. Norton's logging of such events changes from time to time, so occasionally you may see a program appear in the logs for the first time, even though it has been installed for awhile.