Ifram.B.Gen.Virus

I'm having a problem and am not sure what to do. I'm getting a pop up on multiple sites.

Threat: HTML/Iframe.B.Gen.Virus with the connection terminated - quarantined

It list the web address with a ad/largead.js or
ad/squaread.js

I've scanned my hard drive with both Malwarebytes and Eset and nothing is found. This pop up is showing up on both computers running eset.
But its showing up on random pages, some of which I've been to before with no problems. And the problem just started showing up a day or two ago. Before that I had no problems.

 

Please submit the files from quarantine to ESET's viruslab for analysis.

 

If you're unsure how to submit the files to our Virus Labs, here's the KB Article showing how!

http://kb.eset.com/esetkb/SOLN141&ref=wsf

 

Have you considered a Hosts file ? In order to avoid these exploits, or perhaps tightening settings on your Browser in order to minimize IFrame attacks.