I am a computer collector, frequently buying refurbs rather than new in order to save money. I currently own between 115 and 140  computers and/or computing-class devices, depending on whether certain devices are counted (e.g., Alexa devices?, Google assistants? smartphones?). That is not bragging. I tell this to give a context in which to evaluate my review. This includes plenty of PCs with Windows 10, as well as 8, 7, XP, and more, plus Macs, tablets & phones (Android mostly but quite a few Apple ios), in forms of desktops, laptops, all-in-ones, etc., going back to a TRS-80 Model III purchased February 1982.My real reason for the purchase of a refurbished HP EliteDesk 800 G2 was the 32 GB RAM. It was helpful that it has a sixth generation core i7 chip as well as a 500 TB solid-state drive. (Up until this past month - April 2020 - the largest RAM capacity I've had in a single PC was 16 GB, which had been my standard for most Windows PCs and Mac. I also recently purchased a Dell laptop with 32 GB RAM, and this week I am increasing the RAM on my Dell XPS 8700 from 16 GB to 32 GB.)I added a refurbished 27" curved Scepter monitor and a lightweight, portable 1 TB external hard drive, the latter to afford room for keeping about 300 GB of movies that would choke the internal hard drive. It also is the backup drive for the internal C: drive.Performance is decent, but it is hard to tell. Why? For several days of setup, I kept running into the same three or four problems that seem to relate to Windows 10, as follows:a) Dropbox Business, annual paid version, in use on my Windows PCs, kept crashing, despite lots of tweaking.b) The PC and/or Windows 10 simply would not let Chrome open. I installed Firefox.c) Windows Defender kept having problems, including never turning on real-time protection.d) Various Windows warnings and interference with installation or running of programs.After several days, I babied Dropbox, which currently uses 13% of my 2 TB allotment. My remedy was to let it have just small downloads via limiting same using Selective Sync. Eventually, I seem to have it stabilized, but after 10 days, I cannot say I can trust it as I can on other PCs. As for a browser, after using Firefox for several days, I retried Chrome and for some reason it now seems to work fine, no longer having the earlier problem. I am too heavily invested in and reliant on the conveniences of Chrome with Google search to be willing to give it up - and I never use Microsoft Edge with its Bing search, or Internet Explorer, unless I have to or for some comparison test.As for an anti-virus product, I gave up researching how to get Windows Defender to turn on real-time protection and switched to one of the free competitors - in this case, Avast. I am using the free version, although I've had good experiences also with free versions of Avira and Kaspersky on other PCs.SUMMARY: I almost returned the machine... and indeed, I will be watching closely the new week or two to make sure it is more beneficial to keep than return. But, is it fair to take out software problems (Windows 10) on the hardware? I like to think I am pretty good with getting around Windows PCs.  It may seem a bit unfair, but the machine is largely inseparable from the operating system, at least for most people. I use a lot of Windows 10 machines and have a slight preference for Windows 7 still, but the problems on this machine are unusual.After 10 days, things seem stable for the moment. However, I do not quite feel the power or speed of 32 GB of RAM on this desktop PC the way I do on my refurbished Dell Latitude 7480, which also has a sixth-gen core i7 processor, or as I do feel on my Dell XPS 8700 desktop with 32 GB RAM. I can't say it's this HP 800 desktop PC that is not that good, but somehow, it just does not have that same feel or pep that it ought to have - maybe because of the problems I've had. As my testing and installing continue, I am getting a better feeling, and I am currently at giving this 3.5 stars, but still short of 4 stars out of 5.UPDATE: Minor edits added 8 May 2020, plus I am mentioning that I have decided to keep the machine. I have definitely tamed it to overcome the earlier deficiencies, and I would rate it 3.8 now... but not enough to give 4 stars. This is not so much because of existing problems; it is because the initial trouble I had means that I cannot reward this system and/or the seller for the problems it gave me and could presumably be giving other buyers.(Dr. Michael W. Ecker is a skeptic and a  Ph.D. mathematician - CUNY 1978, Ph.D. Summa Cum Laude - who researches and writes prolifically. He is also a retired PSU mathematics professor and former computer journalist. He owns well over a hundred computers/ computing-class devices.)