Today I dealt with a Lenovo ThinkPad E545 laptop that refused to enable Wi-Fi. In the network pop-up from the notification area icon, it said "Wi-Fi off." Flipping the appropriate switch in the Settings app had no effect; it just went back to Off immediately. Reboots didn't help, everything seemed fine in Device Manager, and no third-party VPN software (which is sometimes the cause of Windows 10 network troubles) was installed.
The only other thing I could think of was to install a different driver. Lenovo hasn't published Windows 10 drivers for the E545 yet, but I found some for 64-bit Windows 8. Bizarrely, they had drivers from at least two different vendors. The Realtek installer actually ran - as opposed to others which didn't. After setting the driver in Device Manager to the new Realtek one, the Wi-Fi switch actually worked, and sure enough, Wi-Fi turned on as normal.
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