My problem is solved.
I had to spend hours with AT&T Tech Support over the phone but everything works now, especially VirusScan.
My main problem was that I couldn't use the McAfee Removal Tool because it detected "Enterprise" version software, which it isn't designed to remove it for some reason.
But the Techs linked me to a different McAfee Removal Tool here : us.mcafee.com/root/mcpr2.exe
After I ran the Removal Tool it was successful in ridding all my old McAfee files.
Then I rebooted in 'Safe Mode', checked around for any old third-party security software products still laying around. None were there. Then I deleted some 'temp' files by accessing the 'run' bar on the Start menu, typing in 'temp'. After deleting those files in that folder I again went to the 'run' bar and typed in "%temp%" and deleted the files in that folder as well.
Finally, while still in 'Safe Mode', I downloaded the AT&T Security Suite and installed all the components without a hitch. Rebooted in normal mode and here I am.
I guess no one here knew how to fix my problem since it was so particular to my computer. But thanks to any moderators who read my posts and did their best to try and solve my problem.
happy
Bye now.