Dirtjumper and suspicious network traffic

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The more you look the more you will find and the more panicky you will get. A lot of the IP's in your log file are non malicious, I have not tested all of them but the ones I did had no malicious intent. Its hard to help without looking at the issue in hand live with wireshark or some other network monitoring software.

You have reinstalled Windows a number of times and I would say that most of this traffic is Google, Microsoft, ISP, etc etc.

Check to see how many devices are connect to your network at any one time and check connection logs.

I would not worry your self sick about it, sometimes when you get a idea in your head it can drive you nuts. I am pretty sure that if you wipe your PC they will be nothing to worry about.

Good Luck