Delete the following files:
Go to the User's Library folder. This folder is hidden by default. To unhide: Select the Finder in the Dock. Under Go in the Menu bar > hold down the Option key and you’ll see the Library.
Home/Library/Caches/com.zeobit.MacKeeper
Home/Library/Caches/com.zeobit.MacKeeper.Helper
Home/Library/LaunchAgents/com.zeobit.MacKeeper.Helper
Home/Library/LaunchAgents/com.zeobit.MacKeeper.plugin.Backup.agent
Home/Library/Preferences/com.zeobit.MacKeeper.plist
Home/Library/Preferences/com.zeobit.MacKeeper.Helper.plist
Warning: Only files containing the words ‘zeobit’, ‘MacKeeper’, ’911′, or ’911bundle’ should be deleted.
(In Mail Library folder, check LaunchAgents and LaunchDaemons just to be safe)
Go to Applications -> Utilities -> Keychain Access and open it. Unlock the Keychain and enter your Administrator password. You need to remove any items in the Keychains that contain ‘MacKeeper’ or ‘zeobit’.
Open Activity Monitor, and choose to view ‘All processes’. Check to see if any processes called ‘MacKeeper’, ‘zeobit’ or ’911 bundle’ are still running. Older versions of MacKeeper might have a ‘WINE’ process. If you see any of these, click on the process and hit ‘Quit Process’.
Finally, go to your Applications folder and remove MacKeeper.app by moving it to the Trash. You should also unpin it from your Dock by dragging it off.
Empty the Trash by clicking on Finder -> Empty Trash.
In System Preferences -> Users & Groups (or ‘Accounts’ if you’re using OS X Snow Leopard 10.6) -> Login Items. If MacKeeper or anything related to it is listed there, highlight it and click the ‘-’ button to remove it.