Hi
Do you know which is the boot drive with windows on it?
If so remove or disconnect the other drive
Re boot go into BIOS / UEFI and set only hard drive as boot drive
If this works shut down .
Re connect next drive , go back into bios and set which of two drives is boot drive
If you are un lucky boot partition may be on one drive and c: windows on the other then in bios boot device is one with boot partition
Regards
Mike Barnes