Which browser are you using? look to see if the program is an “add on” or try a different browser and see if the trouble goes away. Also check the settings on your tool bar or switch tool bars. I presume you have looked under “uninstall a program” to see if the program exists there.
I don’t have Comcast so I don’t know first hand about the problem you have but, unless it is some type of malware, it is either a) a program b) an add on to your browser or c) part of some sort of toolbar you uploaded.
You can also call back to Comcast and ask for “tech support” and if they give you the same answer, ask to speak to a supervisor until they tell you how to remove it. Ask them to walk you through removal.
I use Firefox but will try I.E.
I’ve looked on the tool bar, it’s not an add on, also been to uninstall programs, it’s not a program.
I can’t call Comcast as I’m hearing impaired and my phone doesn’t have the program, I hear enough to get by in person but a phone is almost useless to me. I went to Comcast’s web site forum and they have a rep there that gets hundreds and hundreds of complaints about this same issue, he denies, denies, denies that it is a Comcast problem, that users or their computers are in error, also the people on that forum have called and they either are shuffled from department to department or get the same song and dance as they put out on the web forum.