Avira Antivirus Update I Cannot Update My Avira Antivirus?

I cannot update my avira antivirus? - avira antivirus update

I can not update my Avira antivirus. I do not know why. They always say that failed Connetion. I tried AVG 8 and moved into the same problem occurs. I come to Avira and always say the same thing. I do not know know exactly what to do now. I think I am infected with the virus but do not know how to remove it. I also try Spybot Search and Destroy, but still does not work.