Installing internet security pro and pc tune up pro

I completely uninstalled AVG internet security and tune up from my computer. I reinstall Internet security, restart as prompted and when I install pc tune up it automatically uninstalls Internet security. If i install tune up first it won't install internet security (says it is downloading for hours). I have had both programs on my computer in the past. Running windows 10 pro. I have the 2 yr 2 computer for both programs. I have tried this quite a few times with the same results.