This is driving me nuts: I have two separate HDD's: one for windows 7 and one on which I recently installed Windows 10. When I have finished using the Windows 10 drive, shut down and plug my Windows 7 drive back in. When Windows 7 boots up, the mouse cursor is stuck in the middle of the screen. The mouse and keyboard do not work. I think I found a fix which is to reset my BIOS settings back to default (MB= ASUS Z87A). Does using Windows 10 change BIOS settings so that Windows 7 does not work?? Can anyone help me with this problem? Thanks!