Any free virus/spyware protection for my IMac?

I got what I thought was a "fake" apple support virus deal...Not sure what to do..
Thanks.

You may a trojan called  Mac Defender   / Protector / Security
Check you downloads folder and apps folder to see if it is there If  you not find it
-If go to safari, preferences, general, deselect  - open all safe downloads ( may not be exact wording)
If you find it go to  DO NOT SIGN UP or GIVE CREDIT CARD INFO....
Go to acitivity monitor in ultilies - quit the program.
trash it from downloads, app folder, remove for Login Item in accouns (sys. pref)
Boot into safe mode - hold the option key down and when you restart the mac
look at these locations to see if remains.... if found try removing them again
Uncheck the safari pref as above
I advise getting security software or wait for Apple to come up with a security fix

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