Comment 1 for bug 950092

Ads are disabled if you meet these requirements and do the following:

* On the Control Panel, on the left-hand menu, click Business settings.
* In the Preferences section, select the Advertising status option that reads Do not show ads on results pages ....
* Click Save Changes button.

http://support.google.com/customsearch/bin/answer.py?hl=en&answer=70354