If the connection worked well with your old computer, it's probably an issue with your new computer = hardware. It
could be an issue with Windows updates, check you have the latest, but I doubt it. Even without updates, the "original" Windows 7 works fine.
You could try with another browser, but I wouldn't be so sure about that, either. Windows usually recognizes net connections quite well. One thing is cable connections, check them - plug off and in, everything is not bits, it's also about physical contact. Or a wire may have got twisted, or something, hard to tell from here.
If you have a USB3 netcard / stick, that could be a problem. It needs the latest updates from Microsoft.
Altogether: With a new computer, check your seller, and use the warranty. No need to fight a one-man-war.