Windows "End Program" Pop-Up Alerts

At times for no apparent reason, Windows decides to present a POP-UP when shutting down which says something like " Blah-blah-blah program is ending" and says you can either end the task and lose any unsaved data or return to Windows and have a nice day.

This happens out of the blue and whilst it is very interesting to know that something in Windows wishes to be recognised as a living thing, to me it is very annoying, when I have to my knowledge done nothing to deserve this irritating little panel popping up.

It is all tied up with the EVENT VIEWER which can be coaxed out of it`s coffin by clicking CONTROL PANEL and then ADMINISTRATIVE TOOLS.

The log file show all the "events" and some ERRORS marked in red with a cross. Oh dear, what a calamity.

What exactly do these END PROGRAM panels mean in real terms - have I done something wrong ?

Also, what are we supposed to do about the EVENT VIEWER log ? Just look at it and admire it`s sheer beauty or jump into action and do something ?
KAS