Hi again Neti.
You've had a few problems with your Win 8 machine and I am beginning to wonder if if your installation is faulty?
You can do a refresh from the Settings menu (hover in the bottom right corner)
Choose Change PC Settings, go to General, scroll down a bit and chose "Refresh your PC without affecting your files".
This is a bit of a drastic option and you will lose the programs that you have installed since you got it.
Or, if it is still in warranty, go back to the shop where you purchased it and see what they think.
This is just an opinion.