Removing Red banner Dashboard plugin

As a newbie, WPMU plugins I tried out do not play nice with my business theme that makes me money. I'm fine with this, not everything is going to work together.

I uninstall all the WPMU plugins and what do I have? A screen wide RED banner
on every single page I go to. Over one hour of my unpaid time searching the forums
to get to this.

Nice? Not really. Use a plugin? Lets keep the horse in front of the cart. When I deactivate or uninstall ANY software...it needs to leave, completely.

How is this important? As a new paying customer it's frustrating enough to cancel my new membership before Aug 26.

Where do I find the legacy WPMU coding in my WP installation so I can remove this message?

Thanks