Hello,

Try removing SEP client using msiexec command. You need to create a small batch file with the help of following article.

To uninstall the Symantec Endpoint client using comand line 12.x:

1. Log on the system with administrator rights.
2. Find the Symantec Endpoint Protection uninstallation product key:
3. Click Start, then Run.
4. Type regedit to open the Windows reistry editor.
5. Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\
6. Browse the Uninstall sub keys in the left-hand pane, check the values in the right-hand pane to find a value for DisplayName that is Symantec Endpoint Protection.
7. Copy the uninstallation key.
   For example the key for Symantec Endpoint Protection 12.1.671.4971 is A3AEEA68-AC93-4F6F-8D2D-78BBF7E422B8.
8. Click Start, then Run.
9. Type cmd to open the Windows command prompt.
10. At the Windows command prompt type:
    msiexec /X {product uninstall key}
    For Example: msiexec.exe /x {A3AEEA68-AC93-4F6F-8D2D-78BBF7E422B8} /passive

    To generate a detailed uninstall log type:
    msiexec /X {product uninstall key} /I*v! log file path

• Example: msiexec /x {A3AEEA68-AC93-4F6F-8D2D-78BBF7E422B8} /lv!* c:\uninstallSEP.txt

Note: If the MSI uninstall has stopped responding:

1. Click Start, then Run.
2. Type taskmgr
3. Click the Processes tab.
4. Click End Process for all of the running windows installer processes by: Right-clicking onmsiexec.exe then clicking End Process.
5. Repeat this task for each instance of "msiexec.exe" listed.

Refer this article:

How to uninstall the Symantec Endpoint Protection Client using the Microsoft Installer (MSI) command line interface.

http://www.symantec.com/docs/TECH102470

SEPprep competitive product uninstall tool

http://www.symantec.com/docs/TECH148513

Also take a glance at these 3 links and let me know if this answers your question.

http://www.symantec.com/connect/forums/uninstalling-sep-remotely

http://www.symantec.com/connect/forums/remote-uninstallation

https://www-secure.symantec.com/connect/forums/uninstall-client-remotely

Hope that helps!!