[ubuntu] Problem with a popup

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http://ubuntuforums.org – I am using Ubuntu 12.04 and I have had this popup appearing all of the time. It is using bandwith in the background because my puter slows down almost to a complete stop. The cpu light is flashing and finally this popup comes up on the desktop. I have googled the name of the virus but all that comes up are remedies for windows. The popup name is: lax1.ib.adnxs.com I have reformated the puter already and it worked for about 2 days. I am using Chromium for a browser because it syncs my bookmarks and everything else that I need for work and home. At work I am on a Mac Lepord OS and it doesn (Hardware)