BIOS is not disabling it? You checked for hardware-switches that could disable it? Any kind of black-listing?
-> Press Windows key + R and type services.msc in the search field and press ENTER.
-> Double-click the Bluetooth Support service.
-> If the Bluetooth Support service is stopped, click Start.
-> On the Startup type list, click Automatic.
-> Click the Log On tab.
-> Click Local System account.
-> Click OK.
-> If you prompted to restart the computer, click yes.