My friend is running a laptop with Windows 7. She connects to the wireless router 2 doors up. When they first got the laptop, I fixed it up and allowed it to be able to connect. It was fine for a while and then suddenly couldn't connect. They sent me the laptop and as I turned it on it immediately connected to my wireless network. I took it to their place, and they had already tried cycling the router and modem power supplies. I also noticed that all other mobile devices easily connect to the access point. I removed the router from the saved access points and tried to set up a new one. It can't find the access point by searching because the router does not broadcast its SSID. I manually set up the SSID, password, etc. Now it can see the access point, but can't connect to it. There is a red X that claims the configuration settings saved on this computer for that specific SSID is wrong, to which they informed me was the problem that suddenly occurred and why they sent it to me in the first place. I had to leave before going up to the computer two houses up and entering the router configuration page, but want a better idea for a solution when I return. Currently my only idea is to return, check the authentication method is in fact WPA, and if it's not reconfigure the settings on the laptop.
I have an ASB in Computer Science and Programming and an AST in Network Administration and Security. I should have had no problem with this but I've been out of work for a year now due to a disability from which I'm almost recovered (enough). I suppose it's possible something had escaped me but the computer has no viruses, spyware, adware, or malware. All programs, drivers, and Windows updates are current. I used CCleaner to correct the registry errors. All of the configurations for the access point seem accurate with the SSID name and password both typed correctly. I've never heard of a firmware update changing a router's authentication method, so I didn't feel the need to stop using WPA-personal.
Any advice would be much appreciated.