Hardware Reserved Memory 5.5GB

I've never actually seen that type of problem on any machine here going back to 3.1/9X! 98SE wouldn't even run with anything over 500mb back then. But this also reminded of Vista's SP1 correcting the lack of accurate memory totals in that older version there.

10 still has some bugs in it to be worked out as any new version would see. Something you have added on right before the problem started would be attributed to some 3rd party clash while in most cases either there's a hardware issue or something in Windows is goofed up royally!

You're not ocing anything are you? That could be another possible source if you have turned things up any like memory timings if not the cpu itself. Have to look at anything and everything at this point.

Well this was something I suspected earlier in the thread when first asking at the top of the thread since the 32bit will only allow some 3.571 or so gb to be usable while the rest above that is simply mapped out to hardwares!

This is precisely what is happening and nothing unusual just the wrong flavor of Windows to begin with! You now need to download the 64bit 10 Pro and see that go on to replace the present 32bit you have on. One look at the "System type" in the CP>System info shows what you are running.

Replace the upgrade with a clean install of 10 to solve the bug! It seems about only one out of three upgrades will come out in working shape while the other 66+% see some type of problems come up! The fast and easy is simply to prepare for the upcoming clean install to follow any bugged up upgrade! If you should be planning any other upgrades to 10 you may want to review a particular guide that save you some time and effort. Clean Install Windows 10 Directly without having to Upgrade First - Windows 10 Forums