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The Realtek adapter that I initially was dealing with is now gone. I found suggestion to uninstall the network adapter, restart and hopefully that reinstalls the driver. Received a "message" that I had the driver recommended and/or up to date. I checked for driver update, there were none.
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There was an indicator there (the yellow triangle I think). The Network adapters under Device Manager. The troubleshooter narrowed it down to the Realtek wifi adapter. After a few days I realized that was not the case. Initially I thought it was due to a dead spot in our home. This is the laptop I use to work from home during the COVID-19 quarantine.
Realtek rtl8723de 802.11b/g/n pcie adapter specs drivers#
When I ran a particular driver I found in the Realtek website, the Realtek RTL8723DE 802.11 bgn WiFi Adaptercompletely disappeared, and I can't get it back on with any of the drivers I found nor restarting the PC, so now the wifi option doesn't even show up. I found some in the Realtek and HP, copied them to my USB drive, then took them to the laptop. Last advice I found suggested to look for the driver on the Realtek or HP websites. I double-checked the password several times trying it in different devices, turned the router on and off. This didn't work either: it showed up again but the issue continued. Then found another advice to type Start + X, go to the Device Manager and delete the driver Realtek RTL8723DE 802.11 bgn WiFi Adapter and after restarting, it would show up again but fixed.
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I found the usual advice saying to "Forget" the network and re-enter the password, which didn't work. My HP laptop runs on Windows 10 and was not connecting to the wifi network, displaying the "Cannot connect to this network" error.