If the SMP log does not have sufficient logging to provide information needed for troubleshooting, you may need to enable verbose logging from within WIN PE.
When in WINPE run the following command at the command prompt
reg add "HKEY_LOCAL_MACHINE\SOFTWARE\Altiris\Altiris Agent\Event Logging\LogFile" /v Severity /t REG_DWORD /d 0xff /f
Additional information will now be provided in the SMP logs