Just have had serious troubles myself, ended up with replacing three hardware components just to get rid of one or two broken, could not nail it down any other way. System newly installed with gfx card, HD and monitor replaced. So - I feel with you, Fräulein.
In your case, check the obvious things first. Manually remove nVidia driver (the automatic installation of other drivers over the installed ones, as is saisd to be possible nowadays, ALWAYS leaves artifacts on my rig that start to interfwere with the new one), then install a new one. Very solid builds are 275.xx and - I'm just using it for days, but no probs so far - 214.xx.
If possible, reset your mainboard.
Check that dust flocks are not shortcutting something, mainboard circuits or USB plugs.
How old is the PSU, and is the output adequate for the gfx you use? You want to have some reserve there even under maximum stress. PSUs wear out over the years. I had to replace mine some years ago - that silenced a whole bag of gremlins haunting my rig back then.
How old is your HD? It also wears out. Try with a different one. Sorry, that means new installation or copying a safe image. You could use an old one with an already existing old installation and see if the problem continues to show up.
Replace the gfx, if possible.
Have a clean installation or image copied over. Check BIOS settings to be back to default, you can change them later.
Unplug all cables and connectors and replug them. Make sure you are free of static electricity when doing so. The resetting of the mainboard should be done after that, to be sure.
If none of this helps, then I fear the chances are raising that there is trouble with the mainboard itself - if for no other reasons than that not many other components are left that could have broken down. You could check the RAM bars one by one to see if one of them is faulty, but I doubt it. You just moved to a new house, boxes and things may have gotten some kicks during that. Could be a micro-fraction on the mainboard's circuits, for example, changing temperatures constantly changing the width of the breach, so sometimes the contact is made, sometimes not.
It'S a PITA trying to nail down the root of such unspecific problems, I just went through the whole dance, and it costed me time and nerves. Good luck!
P.S. Your router, modem, whatever you have, working fine?
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