If it originally came with Windows 7 go back to factory conditions from the recovery partition (if that is still there) or recovery media (that came with the PC, that you made yourself or that you ordered with the maker). If for some reason you can't do that, and you installed a generic version of Windows 7, download and install all necessary drivers from the makers site. Or, even better, install Windows 10 without going through the detour of Windows 7, if the maker has Windows 10 compatible drivers or they come with Windows 10.
If you don't know what you did, nobody can tell if it was right or wrong.
I ran into trouble with my windows 10 being wiped off the pc. Started with installing Ubuntu, worked very well, did not face any adapter problem to get to the Internet.
In my quest to get back to Windows 10.
Went on to the Windows 7 installation, installed without issues.
At the end I found adapter problem, adapter and its driver missing the troubleshoot tells me.
I read Mr. P.Proffitt 's note on the issue, but not sure what and how I should correct it. Internet not available, it is difficult to follow generic instructions ! Or that is what I understand.
There was a point where I had to choose a device, while installing Wins 7, did not understand it and muddled through and got pass that point.
Please help.

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