I facing same issues, and i call calling to technical support person, Fix My Computer Dude. But you try to connect your computer through cable and update all System drivers.
Wireless home network, 2 desktops, 1 printer, single router/modem. Installed Win10 on computer 1 previously, no problems. Installed Win10 on computer 2 today. Installation went OK, but lost connection to network and therefore to Internet (comp. 1 connects fine). Troubleshooters all point to unplugged Ethernet cable, but there never was one on this totally wireless network. That was no help, and neither was tech support from Comcast and Microsoft. Anyone have luck fixing this?

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