Hover your mouse over the tray icon for security tool and it should pop up a tool tip displaying a number. This number is the .exe on your system drive. Note it down.
You then need to boot up in safe mode.
Search for the number.exe
Delete it.
Reboot in normal mode.
If it's still causing a problem after this we need to edit the registry. So post back on here and I'll step you through it.