I thought I'd pass on the following information in case it proves helpful to other MAC owners/users.
This morning I logged on, and received a message "NOTICE! The system is infected!''
The computer did a scan, and then flashed up:
Security Status: Unfortunately your computer is infected. Four viruses were detected:
Worm
Rootkit
Spyware
Adware
It then asked me to install Mac Protector (which I did), and asked me to install Mac Defender for $59 (which I didn't - I am in America, hence the $ amount).
Then, I began to get various pop ups for Gay Porn.
I sent an urgent email to my tech support fellow. He told me I was the first case he'd had of spyware on a Mac. The 'scan' the computer did was an internet pop up window. When I clicked on the (fake) Mac Protector, I installed the spyware.
In case any of you get 'caught' as I did, here are instructions to remove the spyward. You have to scroll down a bit to get the step by step directions.
www.bleepingcomputer.com/virus-removal/remove-mac-protector
Hope that helps some of you avoid my little adventure!