Updating all the time MBP 10.6

I know I have found this for 10.5 somewhere, but now I can't...Sorry. Been searching the FAQ's and forums for two days now. 

 

So this is the problem. Live update checks for updates every 4 hours on my MBP. I looked at the Live Scheduler to make sure the update progress is hidden. Check box is checked. I have fixed this on my wife's MB running 10.5, so I'm sure it's possible. But, I fixed her MB over a year ago and don't remember where to look. Assist? Thx.

 

Steve