Is this apple virus warning real and official?
Hello,
In the past I used to get these virus warnings but I would ignore them since they looked way more unofficial and since I had heard the warnings that are requiring you to install MacKeeper are scam. However this one popped up today and I was concerned since it looks like the official Apple site and says my system is seriously damaged. Is this warning real and should I install the MacKeeper or any other virus program for my Mac?
MacBook Air, OS X El Capitan (10.11.2)