Run through the following steps to fully remove the Symantec Management Agent (A.K.A. Altiris Agent).

Run the following command line to remove the Altiris Agent using AeXAgentUtil.exe located by default at

C:\Program Files\Altiris\Altiris Agent\

If you are running this on Windows 2008 or Windows 7, be sure to run this in a command window running as administrator.

AeXAgentUtil.exe /clean

This will remove all plug-ins (agents) and from the computer.  A reboot of the computer is required if you plan to reinstalling agents.

Optional: Delete Program files at :

C:\Program Files\Altiris\Altiris Agent

The utility cannot clean itself out while it was running.

You should also go and delete this resource on the SMP console.  It frees up a license and keeps things tidy.