Then time to check to see if USB is being halted / not initialized. Are the drives on when you power up Windows? If so, power them off, power up Windows, then power up the drives.
Also, check to see if your BIOS has enabled legacy USB detection - if so, turn it off and see if it makes a difference.
Finally, check the power settings for all your USB ports to see if Windows is auto shutting them down - if so, try disabling that 'feature' and seeing if that works.