I have an ASUS with a solid state drive as C: and this is where my OS is installed. Most (not all) of my programs are installed on D: (not solid state 1 TB drive). I am having lots of stability problems with my Windows installation to include missing Network drivers. Can I reinstall Wind 8 "on top" of what I already have, or must I do a clean install? I assume that if I have to do a clean install, windows will not know about all of my programs on the D: drive and I would have to reinstall them as well?