Their McAfee security software allowed a trojanfakeav.b to get into my computer. It was able to not only to shut down the Microsoft anti-virus protection but also the McAfee protection as well. When I contacted AT&T by phone I was transfered to a Tech support who wanted to charge me $99 to fix a problem that their service allowed, not to mention their usual run around procedure of transfering me to different departments for 2.5 hours and then hanging up on me.