I need a solution
Everything was fine until Apple issued system update OS 10.9.2. After that my Columbia University Enterprise copy of SEP 12.1.4 stopped working. I reinstalled it and then received multiple error messages saying 'System extension cannot be used' One example of an error message is 'The system extension "/Library/Application Support/Symantec/AntiVirus/Signed/SymAPComm.kext' was installed improperly and cannot be used.' Others were similar, but referenced different extension files.
Can you please tell me how to fix this?