If the computer has no agent, this shouldn't matter. Consider the following scenario:
- A computer is managed and has the Altiris agent installed.
- A job is sent that will execute in WinPE
- The computer is prompted to reboot by the Altiris Agent
- The computer tries network boot first and receives a DHCP offer from PXE, since PXE recognizes that it has a job for it
- The computer boots to WInPE
- The computer executes the task.
The Altiris Agent in Windows only functions to reboot the computer. If you take out item #3 above, it should be exactly the same, provided you can assign a task to it. Have you tried assigning a task and manually rebooting the system? However, if the machine's IsManaged property is set to 0, then this will not work. The PECTAgent performs an IsManaged check and if 0, will most likely exit. What's IsManaged set to (check vComputer)?