Because many of us are waking up to the idea that malware is a threat to the Mac, malware writers have made it their business to play on that fear. There have been cases of malware writers disguising their viruses as antivirus apps - two notable examples are Mac Auto Fixer and MacDefender. It's important to always read reviews on reputable sites such as Macworld before installing any software on your Mac or MacBook. At the same time, don't believe everything you read. MacKeeper is a great example of an antivirus program that has got a bad rap, but it's worked hard to repair its reputation. It has gained Apple Notarization, which means the software has been checked by Apple for malicious components, and the company has garnering certification from various bodies to prove it isn't a PUP (potentially unwanted program), including an AV-Test certificate. That said, we haven't recommended it here, and that's simply because we feel that there are better options available. If you have already installed MacKeeper and wish to try one of our alternative recommendations, we explain How to uninstall MacKeeper.