No restart after upgrading

[Sara Manini]

Hi, I'm having some hard times with my pc after installing windows 10...I used to have windows 8.1 and everything was fine. Since I downloaded 10:
-it's no more possible for me to restart my pc: it stops during the process.
-programs behave weirdly: adobe is going mad, it's no more possible to close skype when I don't need it, and other minor issues.
Now, I tried to go back to Windows8.1, I tried to reset the pc, BUT OF COURSE I CAN'T BECAUSE THE RESTART OPTION DOESN'T WORK!!!
I'm totally disappointed, I want my old OS back...or at least, could someone help me to solve these problems?
Thanks in advance

 

[kamal]

Open CMD in elevated privilege and type "shutdown -r -t 0" without quotes.

 

[Sara Manini]

tried, but no difference: it says that it is restarting, the dancing circles appear, the Asus logo appears, and then it stops :/ thanks anyway!

 

[davidhk129]

Sara Manini,

Since you could run elevated command prompt, do I assume you are logged in and you are on the desktop ?

Assuming that is the case, try this to go back to Win 8.1.......

Start button > left side, click Settings > select Update and Security > left side, click Recovery > right side, you should see an option to Go back to Windows 8.1.
If yes, click the get Started button under it.

 

[Sara Manini]

thanks for your answer, already tried, but since the pc need to restart to go back to windows 8, I cannot do it

 

[davidhk129]

Do you have Win 8 or Win 8.1 product key ?

 

[Sara Manini]

not that I know, it was already installed in my pc when I bought it!