Q: router will not work anymore with new update- how do I fix this?

I just updated to the current software and now I have no connection. I have tried to reset the airport extreme but I cannot get it to recognize my laptop, Ipad2 and iphone.  I have earthlink as my internet provider.   I have talked with them, but they could not help.  I think that some of the numerical addresses are messed up.  My computer works fine at work on a different airport extreme- so I know that it is not a problem with my laptop.