I am a bit confused by the array of different drivers for this model, Dell Inspiron 15 7537; I went to the Dell Support website and saw this (supposedly AGN) driver:
Driver Details | Dell US
Still do not know what else to try.
Installed it and generated this output (still no A, just B, G, N):
Interface name: Wi-Fi
Driver : Intel(R) Wireless-N 7260
Vendor : Intel Corporation
Provider : Intel
Date : 9/19/2013
Version : 16.5.3.6
INF file : C:\WINDOWS\INF\oem99.inf
Files : 3 total
C:\WINDOWS\system32\DRIVERS\NETwbw02.sys
C:\WINDOWS\system32\DRIVERS\Netwfw02.dat
C:\WINDOWS\system32\drivers\vwifibus.sys
Type : Native Wi-Fi Driver
Radio types supported : 802.11b 802.11g 802.11n
FIPS 140-2 mode supported : Yes
802.11w Management Frame Protection supported : Yes
Hosted network supported : Yes
Authentication and cipher supported in infrastructure mode:
Open None
Open WEP-40bit
Open WEP-104bit
Open WEP
WPA-Enterprise TKIP
WPA-Enterprise CCMP
WPA-Personal TKIP
WPA-Personal CCMP
WPA2-Enterprise TKIP
WPA2-Enterprise CCMP
WPA2-Personal TKIP
WPA2-Personal CCMP
Open Vendor defined
Authentication and cipher supported in ad-hoc mode:
Open None
Open WEP-40bit
Open WEP-104bit
Open WEP
WPA2-Personal CCMP
IHV service present : Yes
IHV adapter OUI : [00 80 86], type: [00]
IHV extensibility DLL path: C:\WINDOWS\System32\IWMSSvc.dll
IHV UI extensibility ClSID: {1bf6cb2d-2ae0-4879-a7aa-a75834fbd0e3}
IHV diagnostics CLSID : {00000000-0000-0000-0000-000000000000}