(Redirected) internet problem

I bought two Dell XPS desktops about two years ago at Costco. One for my house and one for my fiancée's house. I am currently running Windows 10 on both of them and have been for about six months. Mine is still working fine. her computer suddenly have a weird problem. She can connect to the internet and get her emails, but she can not connect to any websites. She gets a can not connect message reguardless of what web sites she tries to go to. I have talked to her internet provider, Comcast, and they tell me that it is a problem with the computer, not with the internet service. Our computers are connected to our modems with an Ethernet cable.

I would greatly appreciate all suggestions wrt solving this problem