I was interested in disabling "auto reboot on error" so I went to look for it. You got the directions just about right. After clicking "Advanced" there's a button marked "Startup and Recovery..." - clicking that will bring you to the dialog box with the "Automatically Reboot" option so you can shut it off.

When I put Service Pack 2 in I hadn't checked for incompatibilities - my mouse software made the computer restart something like 7 times before I caught the name of the driver and realized it was the mouse. I have upgraded so it won't happen again... at least not from the mouse.