Don't Get Taken In by MacKeeper
If you get a popup alert (and you may get it even if you have a block on popups) from MacKeeper about a virus called Tapsnake, don't get taken in. I just wasted two-and-a-half hours with them and it's just a nightmare. Even for someone as suspicious as I am the pitch is very clever. First you can't get rid of the damn thing; then they keep upping the ante and wanting more money. Fortunately I was able to face them down and I'm getting a refund but I also called my credit card company and put a stop payment on. I probably shouldn't say more than this for legal reasons, but don't get taken in. Restart your computer if you can't get rid of the popups.