I have installed Windows 7 and tried to use my mouse and keyboard but they are not working. Although I am able to use my mouse and keyboard while in bios. I have 6600k and z170a which I know dont work well with windows 10. I enabled xhci hands off in bios to see if that helped, but it did nothing. I changed the mouses' batteries, and switched its usb port but nothing changed. I have no idea what to do now. At this point I want to just upgrade to windows 10, and suggestions on how to fix mouse and keyboard and how to upgrade to windows 10 without them working?