Do i need anti virus protection with att/yahoo dsl?

Yes

Do i need anti virus protection with att/yahoo dsl?virus scanner

probably not since you only need virus protection for emails which can introduce viruses to your system if you save or download attachments.

Do i need anti virus protection with att/yahoo dsl?anti virus software

Yes. Get = Avast = 4 Home Edition - Free antivirus software - free virus protection for home PC: - full-featured antivirus package designed for home usage.(FREE) = http://www.avast.com
Any computer needs a antivirus program and a spyware program...
Double Yes
You need anti-virus and a firewall, especially if your computer is always online
Try avg free from www.grisoft.com. I have used it for many years with no failures. You MUST use anti-virus when connecting to the Internet.