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I have an Archer C7 AC1750 Version 2 router, three desktop computers, and one laptop. The laptop is running Windows 7 and uses a wireless internet connection. The desktops are running Windows 10 and connect via LAN. Since 2016 all computers and the laptop could connect to the internet without problems. Today after I changed several of the router's passwords, the laptop no longer connects. When I use the desktop to check the wireless connection, I get a message that says "You have no preferred wireless networks. Not fixed."

Here's what I changed:

In Wireless 2.4GHz...

1. Under Wireless Settings, I disabled Enable SSID Broadcast.

2. Under WPS, I generated a new PIN to replace the one stamped on the bottom of the router.

3. Under Wireless Security, I changed the PSK Password to replace the one stamped on the bottom of the router.

In Wireless 5.0...

I repeated these three items.

Then I rebooted the router.

In Security...

Under Basic Security I disabled all three VPN Passthroughs.

In System Tools...

I performed a firmware upgrade. The router rebooted and displayed "Software Upgraded Successfully!"

Finally, I changed the router user name and password. Other than that I left everything else to their defaults.

I have powered the router up several times by removing the power cord but still get no wireless connection. I am at a loss as to what to do. Can you help me?