That isn't under Settings in Spybot 2 or 2.1.
If Spybot is running at startup and you'd like it to stop,try going to C:\Program Files (x86)\Spybot - Search & Destroy 2 or C:\Program Files\Spybot - Search & Destroy 2,whichever one applies to you,scroll down and find,then open SDCleaner.exe,and uncheck Run cleaner on system startup.
So,Spybot generally runs when your computer starts up so it's better able to remove something it couldn't remove during a normal scan.Is that what was happening with you?