Question : Uninstalling CA's eTrust Antivirus silently

I'm attempting to uninstall eTrust Antivirus silently on some PC's but I can't overcome the final hurdle of clicking 'OK' on the last two message boxes. Has anyone any ideas how I can do this ?

Answer : Uninstalling CA's eTrust Antivirus silently

Have you tried the following syntax:

C:\WINNT\IsUninst.exe -y -a -f"C:\Program Files\CA\eTrust Antivirus\Uninst.isu" -c"C:\Program Files\CA\eTrust Antivirus\InoSetup.dll"

Source: http://www.netop.com/tech/support/installation/silent_uninstall/silent_uninstall.htm