Broadcast SSID (Since there were changes, I'd change the SSID to make connecting easier)
Use WPA-PSK(TKIP) Security (Personal)
Use mixed mode.
Use channels 1, 6 or 11 (I use channel 11)
You have to save changes and exit.
Power off the ISP modem/router. Power of the wireless router(if any) Wait 30 seconds, the npower on the ISP modem/router. Wait 15 seconds, then power on the wireless router(if any)
Restart your computer.
Try to connect.
***Please note*** other wireless devices need to be setup for the new network