avast.com resolving as 127.0.0.1

[FireWaal]

My computer got infected from a banner ad, and I ran a boot scan which seems to have cleaned up all of the infected files.  However it seems to still have something running that is intercepting DNS and resolving any Antivirus sites as 127.0.0.1 so avast can't update it's signatures.  Any ideas how to correct this?  I checked the hosts file and it is fine, and I checked the registry is pointing to the correct path for the hosts file.  My virus signatures are from 10/17, is there a way to manually update the signatures?

[maugrimx]

here is the manual updates at majorgeeks http://www.majorgeeks.com/avast_Virus_Definitions_d5150.html they are from yesterday.

it is strange that it resolves to 127.0.0.1 if the avast site is not in your hostsfile.