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@not2qubit the "actual desktop" is not the same as a regular file explorer view - it's kind of a separate "panel", which displays files contained in the two locations mentioned above. As for why 2 locations are needed, the public/All Users desktop is used for placing shortcuts to programs that show up for any logged-in user.
not even necessary to use external freeware for cloning (although the DISM method does require some inbetween storage to store the image before rolling it over the new disk) superuser.com/a/1800083/658200 I was able to migrate my OS to a different disk and it booted so seamlessly I still had my browser tabs afterwards.
for what it's worth, changind the hard drive/SSD and/or RAM will not change the hardware hash, I know mobo replacement would do it but that's almost the whole PC.
We don't know exactly the amount of leaking - and it seems a generally bad practice that will get someone shocked at some point. You also mentioned an electric water heater, I hope that isn't grounded to a nail as well. What country is it? Often it should be possible to retrofit a proper ground even if the code doesn't require it (which is sorta strange). I am not an electrician by trade, though, so I hope a proper sparky will see us discussing and explain one way or the other.
Because the point of grounding is to provide an alternative path for the current that has "gone astray", for example, energising an appliance's conductive outer shell. This alternative path is set up so that the current 1) is more "willing" to take it - so a low resistance towards "ground" where it simply disperses... sorta and 2) causes less damage / damages less valuable things on its way. A nail in a wall is not guaranteed to do 1) if the part of the wall it goes through has nothing conductive and 2) if it does provide a path, it is unpredictable (could be through water pipes for example)
Throwing this in as an example when a text file gets confused with... a text file: there used to be a bug in Windows Notepad that caused certain plain text to be recognised as Unicode, turning it into gibberish: en.wikipedia.org/wiki/Bush_hid_the_facts Funny thing, it's actually caused by a Windows API function, so the "fix" for Notepad was to use a different algorithm; as far as I can tell the original function is still in Windows and still just as faulty.