How can I remove the MacKeeper virus from my computer?

To remove the MacKeeper virus from your computer, one should start by quitting the MacKeeper app if it's open. To do this, right-click on the MacKeeper icon in the dock and choose 'Quit'. If the app doesn't quit, use the 'Force Quit' function accessible from the Apple menu. Afterwards, open the Applications folder and locate the MacKeeper app. Drag it to the Trash, or right-click and select 'Move to Trash' to delete it. It’s important to also empty the Trash to eliminate it completely. Since MacKeeper often installs additional files and may persist through its uninstaller, consider checking '~/Library/Application Support', '~/Library/Caches', and '~/Library/Preferences' for any remaining files related to MacKeeper and delete those as well. For completeness, running a reliable antivirus scan can help ensure that all components of the malware are eradicated from your system. If there is persistent difficulty in removing it, one may seek further assistance from an expert with experience in dealing with such unwanted applications.