You need to uninstall SEP 11.x from a group of Windows 7 64 bit machines using Altiris.
Solution
Create a software delivery package .
Click on 'Programs' Tab.
In the text field against the 'Command line', type msiexec.exe /x {5C75DA6D-F5E3-4D4B-A381-B52B8CA5B1CF} /passive
The SEP 11.x uninstall is followed by a reboot.
Note: If a password is set to prompt during uninstallation, this will not work. To uninstall the client silently, disable the password. You may contact the SEP Server administrator to make the change in the SEP Manager by following the article :http://www.symantec.com/business/support/index?page=content&id=TECH96779