When I try to run any application that requires be run as administrator, Windows tries to show a message box asking for permission. The problem is that dialog doesn't appear.
It looks like that the dialog is lost somewhere out of my screen resolution. My PC freezes, and I just can see my desktop background behind. Ctrl + Alt + Del responds and goes to Task Manager, however it closes the dialog (I can briefly see the dialog after that command).
I tried to change the permission setting on "UAC" but it asks for permission to do that, so I'm stuck.
PS: I can't capture my screen because the "Printscreen" command doesn't respond in this context. I'm using a laptop without additional screens.