Take the 2-minute tour ×  I run into the UAC dialogue often
enough. When it appears, my screen blanks out for a second and
then is reshown with everything dim except for the UAC box. The
box has two buttons, "Yes" and "No". The default button is "No"
and it is initially selected.  At this point, my most common
response is to say "Yes" somehow. That is because the box popped
up in response to something I have done a moment before and it
is something I need to get done. Now, the method I prefer to use
in most similar situations where I must make an answer to a
dialogue box I see quite often is to use one of the shortcut
keys for that box. For example, when exiting winword, I might
not want to modify the document I have open so I would just
press "n", where the dialogue's options are "_Yes", "_No", and
"_Cancel". Likewise, the UAC box's buttons are "_Yes" and "_No".
However, for some reason, pressing the shortcut key doesn't
actually do anything in the UAC box.  I was trying to find other
people with this proble