Give permission to the Quarantine folder open it. Delete the files in Side it..
Then Stop SMC server ( start run smc -stop )
Then Delete all the Logs files from
Then remove your permission from the folder
C:\Documents and Settings\All Users\Application Data\Symantec\Symantec Endpoint P
Protection\Logs
Then Start the SMC service ( start run smc -start)
Then check if the files get detected again.