I see you've already mentioned it, but OK, here's where to go:
- Control System
- Hardware
- Device Manager
- Universal Serial Bus Controllers
- Power Management
Finally, fingers worn to the nub, you will see:
ALLOW THE COMPUTER TO TURN OFF THIS DEVICE TO SAVE POWER
Uncheck it !
Incidently: when my PC went the same way - some USB drives working, some not - I did this and it had no effect. I therefore opened up the case and (get ready to laugh) the tiny screw holding the strip of USB connectors to the back plate had come out and allowed the card to motherboard interface connector to slip slightly out, disabling some but not all USB connectors plus others on the motherboard. Put card back into place, used bigger screw, powered up, happy PC again.