Dell optiplex 390 restarting on it's own?

I installed a new OS on the spare drive, without activating the license and restarted 5 times, no issues. I then installed the chipset and restarted a few times, no issues. I then installed the network driver no issues but after opening up IE, the problem is there again so I don't know if IE had anything to do with it? Either way this should rule out HDD, correct?
 
The new OS for disk 2 on the original drive does the same thing this time without myself installing any driver or opening IE. Looking at the event logs, all errors seems to be pointing to Network issues. Sorry for posing all these screenshots below but it is to confirm network or network driver issue?
 

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Go in safe mode and disable the the network. Restart and see if the problem persists. If it happens when you start IE then start it and see if it reboots. You'll have no network so IE will only show the error about no network connection. Go through the steps to fix network issues from IE. It should enable the network. If after IE does it's thing try to access the internet. If it reboots then you have to look at the network card as the problem.

In one of the errors it says it can't bind to an address because it is already in use. You could also try assigning an IP in network settings.
 
There aren't any issues in safe mode as mentioned. i think this is mobo related but still why no problem in safe mode?
 
I have a USB wireless ethernet adapter here, should I go into safe mode, install that then go into regular mode to test?
 
I powered up to start working on it again and this time the windows repair completed and all looks fine, so far, I will continue testing until tomorrow to know for sure.
 
Only glitch I am now seeing is that the pc will restart maybe only once out of every 10 times when it's powered off so the owner is fine with that and took the pc. Main thing is it does not shut off or restart now from being on like before. Appreciate the help guys!
 
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