Is your access point configured with SSIDs on both 2.4GHz and 5GHz? If you somehow only managed to get 5GHz set up, then it's possible the Windows laptops (perhaps older, 802.11g-only or draft-802.11n wireless adapters) may not be able to communicate on 5GHz and thus can't see it.

Another thought, do you have any special characters in your SSID name? Windows (and some other devices) don't handle special characters that well. I've found that I can get away with spaces with little trouble, but adding other stuff (apostrophes, hyphens, etc) occasionally causes some adapters/software to barf.

You nailed it! The 2.4GHz was not listed in the configuration. All devices are now able to connect. Thanks!!