Did you try another Cord? (Just before doing anything else)
Try in CMD (as admin) ipconfig /flushdns , you connect via wifi or wired?
As i see thats laptop, go to start, then settings (the COG), then after window opens select "Network & Internet" and on "Status" tab on right should be "Network reset" click it and yes to confirm and reset now.
You probably gonna need to reinstall again.
Second might be that driver goes bad or interferes with Windows, connect your phone and do like Thethering, it should be somwhere in Wifi options in phone, go to device manager and right click on "Realtek PCle GBE Family Controller" and update driver and "search automatically" if it says that its up to date, there is another issue.
In start type "Create restore point" and it should pop up window with System properties and on bottom of that window should be "Create", create system restore in case something goes wrong.
Now i would uninstall everything under Network tab (DONT UNINSTALL ANYTHING ELSE!!)
If it prompts for Deleting software tick it.
And after that restart, and install latest (you might need to uninstall previous if it detects).
If it didnt help, just go to system restore and restore it.