Windows Updates?
It's probably windows updates, if the system is that new.
If you are that concerned switch to Linux something that doesn't update without your permission.
I think windows 7 has some control still that allows you to stop windows from updating it isn't as smart as the newer versions of NT so if it says it's off it should be but... Microsoft can ignore your preferences if there are other systems in place still. So after you change your settings to never update check to make sure it's stopped perhaps after reboot (Because registry?)
Windows Defender?
Make sure window's defender is stopped it dosen't work on anything new and uses way too many resources this could also be the problem.
Hacks
There is a way to break windows update so that it never works properly but getting it back up and running is painful.
If you move to windows 10 there is "No way to turn off updates" but if you set don't use metered connections to update and set all of your networks as metered then it shouldn't update...