I just correct the script gived from Gilles, to add the NS server name (to change yours).
Notice: not tested yet this one. Notice also: best to install a data partition, if available, instead a system partition !! :)
You should put, the msi file (from <\\SMPserver\NSCap\bin\Win32\X86\NS Client Installation>) and this script into NETLOGON domain folder, and add a GPO to run it at machine startup.
I would like to test if the system is a server with a data partition, or a workstation a single C drive, to deploy different path according the system type.
if exist "%MYALTIRISPATH%\Altiris7agent.log" exit 183
rem remove all plug-in et agent altiris
if exist "%MYALTIRISPATH%\Altiris Agent\AeXNSAgent.exe" start "" /b /wait "%MYALTIRISPATH%\Altiris Agent\aexagentutil.exe" /uninstallagents /clean
rem cleanup Setup folder
if exist "%...