There are users who click "No" on UAC prompt coz "No" was highlighted/selected by default & cant figure out why the executed program didn't appeared coz they never look into details & only look for "Yes", "No", "Ok", etc & go with "Default" selection, if default selection is not there then action is mostly/always "Yes"..."No" if the mouse behaved erratically & the hit was on "No".
And when the users figure out that the program didn't appeared coz he clicked "No" on that useless window And somehow Google search, etc also figured out disabling UAC & "WOW" it worked, that useless window now doesn't appear.
Now he is a certified expert, atleast on this fix for his frds.