MR5100 won't connect to Windows 10 pc

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CBCrosby8155 wrote:
Router connects to all other devices, including a windows 10 Dell laptop

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First, the router does not connect to devices. It is the other way round. Devices connect to the router. I mention that because that tells you where to start looking.

You were on the right lines when you talked to Microsoft. That sounds like a local network setting in Windows on the Dell XPS desktop.

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CBCrosby8155 wrote:
When it shows up as available it is listed as "hidden ".

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This hints that you are talking about wifi here. Maybe not. Have you tried wired?

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CBCrosby8155 wrote:
Worked with Microsoft today, they couldn't solve.

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Did that include running the network troubleshooter in Windows?

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CBCrosby8155 wrote:
PC has Intel AC 7260 network board.

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Tried looking at the Intel site for drivers?

Then there is this:

Search - NETGEAR Communities – Intel AC 7260