Other Can't Connect to WiFi with one PC

My parent's main PC (Win 7) has decided it will no longer connect to their home WiFi network (BT home hub thing). It works fine on everything else (phones, TV, tablet...) but I couldn't crack the problem at all.

It sees the network and will try to connect, but always fail, yet when I plug it in directly via an ethernet cable it works just fine.

I've tried:
- resetting router numerous times
- restarting PC numerous times
- disabling firewall and anti-virus (Norton)
- disconnecting from the network completely and re-connecting (and re-typing the password)
- running PC in safe mode with networking
- performing a virus scan (it was clean)

My knowledge of things like this isn't the greatest, so this was all I could think of. Are there any other things I could try or tell them to try?
I have performed a Google search, and these are most of the things I understood suggested.


Thanks, any help appreciated

 

Try configuring the connection manually.

Right-click on the wireless network icon in the taskbar (bottom right on the desktop). Select Open Network and Sharing Center.

You can also find your network connections in: Start -> Control Panel -> Network and Internet -> Network and Sharing Center.

In the window that appears, select Set up a new connection or network.
Select Manually connect to a wireless network.
Enter information for the wireless network you want to add:

Network name: (Your SSID goes here, case sensitive)
Security Type: WPA2-PSK, WPA-2 Personal (what ever you have it set to)

Click Next.
Click Change connection settings.
Make sure Security type is “WPA-2 Personal” and Encryption type is either “AES or TKIP.”

 

In the end there was a reset switch in the router that needed poking with a pin, then I just removed the network from the list completely and reconnected and that was all. Such an easy fix in the end, annoying I never thought of it earlier.

Thanks for the help though.

 

next time, also try opening a cmd prompt.

first try

ipconfig flushdns

try to connect if yes ok nothing else to do if no, then try

netsh winsock reset

restart pc