Acer Tablet Cannot Reconnect To (Wifi) After System Restored To Default

I have been using my ACER tablet with my Netgear router for several months with no problems at all. Then last night I decided to restore my tablet to its default settings, meaning that all my programs, apps, files, etc., were erased. Then I rebooted my tablet and started from scratch, entering the requested information. Everything appeared to be going just fine until I turned on Wi-Fi and attempted to connect to my network (Secured with WPA2), which was available and showed Good signal strength. I clicked on it, then attempted to enter my password. As soon as I entered the first digit of my password, the option to Connect to the Internet immediately disappeared, becoming greyed-out. Repeated attempts to connect failed for the same reason.

I called ACER Level 2 Support and tried a couple of procedures which didn't solve the problem. One was pushing the Reset Button twice. The technician told me that I may have a problem with my router settings. He suggested that I go to a local fast food outlet and see if I could connect there. I went to McDonald's and was able to get on the Net without using a password. I returned home and tried again to connect, but still was unable to enter my password.

Would it make sense for me to completely disconnect my router from everything, then reconnect and go through that set-up process all over again? I guess I would have to change my User Name & Password, or whatever is required. Also, if I go this route, should I change my security setting from WPA2 to a different option -- WEP, for example? I just don't want to foul things up to the point where my laptop wouldn't work. I doubt that would happen. I recently received the Ice Cream Sandwich upgrade which has been working satisfactorily; however, it does mean that I'm now attempting to start over from scratch with a different operating system.