First of all what the heck is Internal Error 2502/2503.
I have no clue because you have not explained yourself clearly.
The light`s are out it`s all gone dark.
Internal error on what exactly, a coffee Machine ? see what I mean.
Details Man! how do you expect answers without details on the problem.
Server error ?
looks like a error from a windows install program that you might get when you don't have proper permissions. or something like antivirus software blocking a install. Hard to say without more details. sometimes you might get this if your computer date/time settings are wrong