New Data, Still Weird
Put in a new router - it broadcasts the same SSID for 2.4 and 5 connections.
When I'm in the room with the router, my PC connected fine. I sat at my desk down the hall, it stayed connected. Great. Problem Solved!
Not so fast.
When I try to log back on to the network, I get the same condition as before - I connect to the router, but no internet.
When I log into the router page, I see that I've automatically connected to the 2.4 network, not its 5 version.
I can log in to the guest 2.4 network and see the internet (it's what I'm using to post). I can log into the guest 5 network and see the internet.
All other devices can connect through everything just fine.
It's just my PC, when it connects to this SSID network, regardless of the router, does not see the internet.
I have deleted the network profile by using both:
netsh wlan delete profile name="WiFi network name"
and
Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\NetworkList\Profiles\
in regedit, and tried reconnecting. Same problem.