By the looks of it you are using Windows 7 and I am not sure if you have the same settings in the Airport Utility for Windows.
Normally you would connect to the Airport Extreme (or Express) and from the top menu of Airport utility choose Export Configuration File.
Then load it on the new AE with simmilar steps but last one.
Also not sure if you really have problem with teh Export extreme. This is router and it either works or it doesn't. The problem may be somewhere else and you may find out that replacing will not help - but may as well.