Today I received another DELL Inspiron 17 3737, so I can now test the Bluetooth problem mentioned here. But first, I had to install Windows 7 again… So, the first thing was to disable Secure Boot in BIOS, because Windows 7 does not install correctly with enabled Secure Boot option.
Therefore I had to press the F2 key to enter BIOS. In the BOOT tab I set the following options:
Secure Boot: <Disabled> Load Legacy Option Rom: <Enabled> Boot List Option: <Legacy>
After saving and exiting BIOS I pressed F12 to enter Boot options menu, where I selected my USB stick to boot from (USB Storage Device). Now, I could install Windows 7 without any problems…