So i have an old radeon 4200, i uninstalled the drivers and when i try to install the drivers for my new radeon 7850 it keeps on trying to install the drivers for the 4200 and fails because it has no HDMI. Helps please!
Try going into device manager (Windows + R, type 'devmgmt.msc', hit enter) and see if you still have that 4200 listed. If you do, right click and disable. Then try AMD's automatic driver installer.