[SIX BUGS SOLVED] Bugged menu, closed shop etc
did you do everything in this post? including repairing and updating all components in the computer? Also, do you have c++ x84 installed as well? Sometimes the antivirus blocks the functions of the game, GM wrote that you can also change the battle.net password, supposedly it could help, I recommend using the Advanced SystemCare programs to repair the computer and to detect all the needed DriverDoc drivers, I recommend installing the drivers from DriverDoc or another good program that allows you and later, if you missed something, do it with Advanced SystemCare.
and by the way you can upgrade to win10 for free, i did it a month ago and everything works much better.