I'm glad that you found your way to the event logs - I was on my way out, so that post was short. I probably should have spent more time asking questions rather than suggesting actions this early in the game.
One possibility is that the computer is restarting and then going to sleep - you come in and all you see is a computer that needs waking up. You also mentioned that you do not have to log in when you wake it up. And the desktop did not reload or rebuild like you would see during a reboot - the computer was just asleep. So, what I should have asked you, "
Do you have a password on the account?" and "
Is there only one user account on this computer?"
One user account with no password = auto "log on" after booting
If that is the case, then it is quite possible that...
...some software is causing a restart during the idle night time
...the system logs itself on after the restart
...the system eventually goes to sleep
...you find it asleep the next morning - with the applications closed
I finally thought of a useful search term - so I located the forum threads that I was looking for. They are slightly different, but the apps closed each night due to the system logging the user off.
http://www.sevenforums.com/general-discussion/220520-get-loged-out-over-night.html
and
http://www.sevenforums.com/general-discussion/229710-overnight-logging-off.html
You can see my tiny attempt at helping in that first thread. I suggested opening notepad, entering in some text - but not saving it. That should prevent the system from logging you off and thus prevent the computer from restarting. However, the software can force a restart. That would cause the restart even if an app was opened with unsaved data. I've not encountered too many apps that use the force switch, it is kind of rude :-(
So - you can try the same thing - leave notepad open with unsaved text. Then see if you find the computer looking like this some morning:
Back to the Windows Event logs. The main two of interest are the Application events and the System events. If/when you find all of your apps closed, work back thru the System event log entries looking for a large block of event ID 7036. Those indicate that services are being stopped and I find that grouping easy to scan for.
You can also look thru the Application event log to see if there is an entry like the one mentioned in the second thread that I linked to above - an entry that tells you which application is restarting the computer each night.
As far as the event entries that you found and asked about:
You can select the entry of interest and read a bit more info in the box below the list. A search of the internet for warning 28 leads me to think that it is related to your network adapter. Probably nothing serious. You can research the other entries or copy/paste the info from the box below the list for each entry of interest - then maybe someone can comment on them.