Deactivating SUPPORTER Pluggin

Hi friends

I want to deactivate SUPPORTER Plugin.

First I deleted MYSQL tables of the pluggin manually and then deleted the files of the plugin inside the mu-plugin folder, but with no success, WPMU was totally cracked

Then I read the support forums and try to search and replace:

"add_action" into this "//add_action"

But no success, WMPU was cracked too.

Please, How can I deactivate this plugin? Im a newbie so please be explicit.

Thanks