Norton Corporate Antivirus

I am getting memory cannot be read or written to errors in Norton Corporate Antivirus for Exchange. It happens when it trys to start the autoprotect agent during startup. I am still protected just not to the level that I want anybody had this problem or anything like it. I have the permissions set as high as I can get them for that account and still the same error. Plenty of disk space plenty of memory. I dont have a clue. you can have the points if we find a answer that works.