Google and Facebook (if you use either) would both have told you if you were infected as well, any Comcast/xFinity users would have already been notified as well.
But thanks for the heads up.
if you are ok you should see this message.....
DNS Resolution = GREEN
Your computer appears to be looking up IP addresses correctly!
Had your computer been infected with DNS changer malware you would have seen a red background. Please note, however, that if your ISP is redirecting DNS traffic for its customers you would have reached this site even though you are infected. For additional information regarding the DNS changer malware, please visit the FBI's website at:
http://www.fbi.gov/news/stories/2011/november/malware_110911
Danny