Asus laptop TP401MA Bluetooth quit working after Windows 10 update. Apparently this is a common problem. The computer stops even recognizing that there is a bluetooth adapter present. Here's how I fixed mine with a little help from doctor Google. 1. Open Control Panel and click System. 2. Click Device Manager at left. 3. If a bluetooth driver is still present, right-click and uninstall it. Under USB Controllers, if there is an unknown device, right-click and uninstall it. 4. Then click Action at the top and click Scan for hardware changes. The system will detect the bluetooth adapter and install the driver automatically. UPDATE: The next time this happened, the bluetooth device wouldn't install. It just kept installing the unknown USB device. I uninstalled the unknown device, did a HARD shutdown, left it for 30 seconds or so, then restarted. Bluetooth driver installed automatically.