Free Security Software/Trials
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Mac App Store - VirusBarrier Express
Description VirusBarrier Express protects Mac users from viruses, Trojan horses and other types of malware that affect Macs.
I don't know how to tell if I need to deny something. I denied one item and then I couldn't do a google search... so went back and allowed it to go through - then I was fine. I got this because I inadvertently clicked on a facebook link from someone whose account was hijacked and later got a message from google that said "We're sorry... but your computer or network may be sending automated queries."