The Dell Latitude E7270 & E7250 laptops my company uses have various wifi-related issues under 32-bit Windows 7. They won't connect to certain wifi hotspots (especially iPhone personal hotspot), auto switching sometimes won't work, etc. I've found on the web that others often experience issues with getting iPhone personal hotspot to work with laptops running Windows 7. Unfortunately, none of the solutions I found on the web worked for me. After lots of painful trial and error, I found success with the solution below.