My logs kept recording this line over and over:
25080E07391E,45,4,14,WAL-CSTEPHANT60,SYSTEM,,,,,,,65536,"C:\Program Files\Symantec AntiVirus\Rtvscan.exe",0,,0,301 544 C:\\WINDOWS\\system32\\IPSSVC.EXE 33 1720 C:\\Program Files\\Symantec AntiVirus\\Rtvscan.exe C:\\Program Files\\Symantec AntiVirus\\Rtvscan.exe
What finally worked for me was to turn off Tamper Protection -- the logging stopped immediately.