Compaq Laptop wifi help

I have a Compaq V6000, about 10 months ago I started using a USB wifi adapter. Now I want to go back to the internal wifi system. The internal system was working before I started with the USB wifi adapter. I have uninstalled the software that I installed for the external USB wifi adapter. When I click on the WLAN icon the HP wireless assistant pops up. It tells me the status is On. When I click on the setup button I work my way to a window that asks for my "router log on details" i.e. my password. I put in my password hit next and the next window says "unable to log on to your router". I have the option to reenter my password or reset the router. I'm sure I have entered my password correctly. So now if I reset the router will that erase my password or change it to a default? If default, how do I find the default password? Somehow Idon't really think it is a router password problem If I reinstall the USB wifi adapter the password works fine. At this point in the setup the WLAN mechanical switch is ON the software says ON, but the LED by the mechanical switch says off. So this is where I'm stuck. I appreciate any help, Thanks, Mike