Hello,
What OS are you running?
What version of SEP 12.1 are you running?
Upon checking, the logs, I see you are trying to install SEP 12.1.3001 and here are the errors as seen below:-
MSI (s) (38:FC) [19:14:08:486]: Invoking remote custom action. DLL: C:\WINDOWS\Installer\MSIBE.tmp, Entrypoint: ShowServiceProgress
ScriptGen: ShowServiceProgress() MSIRUNMODE_SCHEDULED
ScriptGen: ShowServiceProgress() calling WaitForSingleObject(scriptStarted) ...
ScriptGen: ShowServiceProgress() WaitForSingleObject(scriptStarted) returned WAIT_TIMEOUT
ScriptGen: ShowServiceProgress() Look for timeout starting SepMasterService or other failure loading SIS.dll.
ScriptGen: CancelInstallation() instructed SIS to rollback
ScriptGen: ShowServiceProgress() returning early due to previous error.
Action ended 19:14:38: InstallFinalize. Return value 3.
.......................
Communicate RB: Prodversion = 12.1.3001.165
Communicate RB: PathToSylink = C:\Documents and Settings\mumadmin\Desktop\My Company_Desktop all_QC Chrolomlin_WIN32BIT\Symantec Endpoint Protection version 12.1.3001.165 - English\setup\
Communicate RB: Oldversion =
Communicate RB: ReasonStr =
Communicate RB: StatusCode = 302469120
MSI (s) (38:B4) [19:15:46:036]: Executing op: End(Checksum=0,ProgressTotalHDWord=0,ProgressTotalLDWord=0)
MSI (s) (38:B4) [19:15:46:036]: Error in rollback skipped. Return: 5
MSI (s) (38:B4) [19:15:46:046]: No System Restore sequence number for this installation.
MSI (s) (38:B4) [19:15:46:046]: Unlocking Server
MSI (s) (38:B4) [19:15:46:046]: PROPERTY CHANGE: Deleting UpdateStarted property. Its current value is '1'.
Action ended 19:15:46: INSTALL. Return value 3.
.................................................................................................
Property(S): ProductToBeRegistered = 1
MSI (s) (38:B4) [19:15:46:146]: MainEngineThread is returning 1603
MSI (s) (38:90) [19:15:46:146]: Destroying RemoteAPI object.
MSI (s) (38:C0) [19:15:46:146]: Custom Action Manager thread ending.
MSI (c) (54:5C) [19:15:46:156]: Back from server. Return value: 1603
MSI (c) (54:5C) [19:15:46:156]: Decrementing counter to disable shutdown. If counter >= 0, shutdown will be denied. Counter after decrement: -1
MSI (c) (54:5C) [19:15:46:156]: PROPERTY CHANGE: Deleting SECONDSEQUENCE property. Its current value is '1'.
Action ended 19:15:46: ExecuteAction. Return value 3.
In case, the OS is Windows 7 / Windows 8, make sure the UAC is disabled.
Check these Articles:
Symantec Endpoint Protection 12.1 client install rolls back, returning 1603
http://www.symantec.com/docs/TECH170259
MainEngineThread is returning 1603 when uninstalling SEP 12.1 RU1 on Windows 7 and Windows XP machines 32 bit.
http://www.symantec.com/docs/TECH185779
SEPM installation rolls back.
http://www.symantec.com/docs/TECH104408
Hope that helps!!