HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstal
This is in the "add/remove" programs. Simply check the keys for SEP 11, and locate the uninstall string key which will be on the right hand side.Mine was something like this
MsiExec.exe /i {C1B0BDC8-0624-4036-90D1-F7DF0EE8C96D}
Note:Script would not run if its password protected
Copy the string to a notepad name it script. bat add few switch to run it silent and no reboot, modified string would be
MsiExec.exe /norestart /q/x{C1B0BDC8-0624-4036-90D1-F7DF0EE8C96D} REMOVE=ALL,