I have full reception on all devices (mobile phone, laptop, tablet), but when I want to connect to our Wi-Fi with my PC, it says either: no connection to the network possible or it is connected but no internet. I've already switched my router on and off again, but it didn't work, I reset my network via Windows, but it didn't help, even uninstalled the drivers on my Wi-Fi card and installed other drivers without success
one probably knows what you can do there
What kind of IP address does your PC get when it connects to the WLAN?
How old is your PC or your WLAN card / WLAN stick? Maybe he can't use the encryption standard you set on the router. Cell phones and tablets are perhaps newer and support that. The PC should be connected by cable if possible, and only devices where it is not otherwise possible via WLAN!
Pc about 5 years has always worked so far
in there's a tplink 300mbits pcie wlan card
I can't see it because it doesn't connect at all now it always says can't connect to the network
You should maybe get a new WLAN card, e.g.
TP-Link Archer T4E WLAN internal PCI-E network card AC1200 with 2x2 MIMO and beamforming (867MBit / s on 5GHz, 300MBit / s on 2.4GHz, 802.11ac / a / b / g / n, suitable for Windows 10/8 .x / 7 / X)