Okay,mind you I'm not very familiar with the scheduled scan,since I usually scan manually,but I was able to set up the scheduled scan and update without Spybot doing an autoupdate/autoscan when I opened it manually,and everything seemed good,so you could give it a try,if you like.
If you do it,you'll probably have to delete the old scheduled tasks and create new ones,though,so it's up to you.
First step would be to make sure that the autoscan isn't set up through settings.Your Configuration.ini file should show me that,so you'd go to C:\ProgramData and open the Spybot - Search & Destroy folder.(If ProgramData isn't visible to you,then here is how to temporarily show hidden files and folders -
http://www.bleepingcomputer.com/tuto...-windows/#win7 )Doubleclick the Configuration file,click Edit,Select All,then rightclick the highlighted text and Copy,then paste it here.