HELP!!!

I am working on a Lenovo Laptop. It has Broadcomm WiFi.

I did a Factory Recovery and once done, the computer had Windows 8 and the wifi worked fine. I got connected to my home router no problem.

I then upgraded this laptop to Windows 8.1, (almost immediately - once I had the needed updates in place). So no surfing, no chance of a virus, etc.

Now when it tries to connect to my home router it says LIMITED, has the small yellow shield over the wifi and will not pull up web pages.

My wifi Security Mode on my router is WPA2-PSK [AES].

Any help would be greatly appreciated.