Altiris Log message:
<event date='Mar 04 13:16:12' severity='1' hostName='XXX' source='ComService' module='AeXNSAgent.exe' process='AeXNSAgent.exe' pid='3200' thread='3976' tickCount='3202875' >
<![CDATA[Unexpected error in ServiceMain: Unknown error]]>
</event>
ITMS 7.x, 8.x
Run CMD.exe as an "Administrato"r and run bcdedit /enum and look at the "nx" value. If its set to "AlwaysOn" then this is the issue. Change DEP to "OptIn".