This happend to me too - Computers: Windows 7 and Windows 10. I detected utopia.net using the command line (cmd): ipconfig /all This showed me all my adapters and DNS connections. On the computers that had utopia.net I disconnected the computer from the internet and searched in the registry for all instances of utopia. (DON'T DO THIS UNLESS YOU ARE COMFORTABLE WORKING IN THE REGISITRY). I replaced all instances of utopia.net with the correct pointer to comcast servers. I deleted nothing! I then changed all the passwords on my WiFi rounter and Comcast Router. I then booted the computers and routers . Now things are fine but I will be monitoring regular since I have no idea how this occured! I am not sure you can blame comcast, the internet is a bad place these days!
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