Due to problems with our 3rd party software not being compatible with Windows 10 I am trying to get Windows 7 running on our Elitedesk 800 TWR G4 pc. This is until our other software issues are sorted out. My problem is that when i try to install windows 7 the mouse and keyboard wont work. I have tried to add some drivers into the intall files but no success. Is it at all possible to do this. If not and i am trying to do the impossible can someone please explain why for my own knowledge.