I had win 7 64 bit on this pc. I upgraded to win 10 ...but it did 32 bit by digital download. going through Microsoft support didn't help. I had another win 10 usb stick so I got win 10 64 running. but I might have messed up. I'm not seeing my 2nd hard drive and the "this pc" is showing I have 2 drives on it. C and D. D says its system restore but there is 54. 4 mb left to fill of 99.9mb. C only has 66.7 gb left to fill of 231gb. Any help would be great.