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Maybe some incompatibility wiith 2.4 GHz and 7260AC at your location. Mine connects fine at both 2.4 and 5 GHz without disconnecting other 2.4 devices. Just for a possible but temporary fix, disable the 2.4 GHz by setting "Wireless Mode" to 802.11a only on the advanced settings located on the device properties.
Good idea @theveterans I'll try that thanks.
Turning the Asus laptop with the 7260 AC card to 802.11g as well as turning off the 5Ghz radio on my router all 802.11b/g devices were able to connect. Unfortunately I'm no closer to determining the cause of my connection issues.
My Lenovo Win7 laptop with an Intel Centrino Advanced N-6205 connects to the 5Ghz spectrum w/o interferring to the other b/g devices w/o issue. Only the 7260 AC card operation causes issues.