How can I delete admin ads on non multisite wordpress?

DO NOT USE THIS PLUGIN if you do NOT have a multisite. If you activate it YOU ARE SCREWED!!!!!!!! Its late and I found a non WPMU admin message plugin but I thought I would get one from WPMU so I thought it was ok to use (nothing glaring out saying ONLY FOR MULTISITE if you activate it you will lose your website access, not have the site show to clients and are basically screwed. How can this be fixed besides reinstalling the site?