Can't do anything, lost admin privileges?

[A6TH]

Whenever I try to do anything, like install a program, open some files, I get an UAC warning saying: :"To continue, type an administrator password", but there's no textbox where I can type the password and Yes button is disabled. I found a solution on the forum http://www.tomshardware.co.uk/faq/id-2122704/user-account-control-doesnt-enter-password-click-windows-windows.html, but I can't enter Safe mode whatever I try, I never get an option to enter safe mode and I can't use msconfig cause UAC blocked it. What can I do?

 

[HEXiT]

you cant install anything because your using a user account on a protected system. get your sys admin to install it for you.

 

[HEXiT]

itmoba please dont select best answers for questions you havent asked especially 1s like this.
the mods dont take kindly to it.

please leave best answers to the op or the mods.
as i have had to unselect it. yes it may be the right answer but the op is the 1 to decide it...

 

[A6TH]

I am actually the owner of the PC and nobody has access to it except for me. So I am my own admin.

 

[USAFRet]

I am actually the owner of the PC and nobody has access to it except for me. So I am my own admin.

What was the last thing you did before this happened?

 

[A6TH]

I am actually the owner of the PC and nobody has access to it except for me. So I am my own admin.

What was the last thing you did before this happened?

I used a local account and then tried to switch to a live account to use Cortana, but I didn't like it and went back to the local account, when I lost all my admin privileges.

 

[HEXiT]

have you tried logging out and back in again?

 

[A6TH]

have you tried logging out and back in again?

Yes, that didn't work. I actually came up with an idea now, maybe System Restore will work.

Edit: Can't use System Restore, blocked by UAC I'll check and see if there's System Restore option while using a Recovery Windows 10 USB.

 

[HEXiT]

boot of the system recovery and if you can
try opening a cmd prompt with elevated privs.
type
net user administrator /active:yes

and when it activates log out and a new admin account should be available on your login screen.
use that to log in then
to turn your user account back into a user admin account from the accounts manager.

1s done log out and log in to the user account, opent the cmd promt (again elevated)
net user administrator /active:no

to turn off the hidden admin account.

log out again to make sure its gone.

 

[A6TH]

System Restore failed with an error: http://oi61.tinypic.com/34gq9ed.jpg But when I restarted the PC, I got my admin privileges back :O

 

[HEXiT]

lol typical...