Swaffy

https://www.w3schools.com/sql/sql_insert_into_select.asp
 
so something like :
INSERT INTO table2 SELECT 'C' as Col1, col2, col3 FROM table1 WHERE condition;  

Did you try the commands in command prompt?
 
The registry entry to check is:- HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell if this is not explorer.exe then change it back so it is. Hopefully you can get in regedit from the command prompt.

I had an old Lenovo laptop with a small 16gb M.2 for caching, I ditched the included software which was buggy as hell and set up readyboost to use it. So I can say yes readyboost does work but it really depends on the the cache hardware your using, a standard USB stick wont give you much of a boost so you really have to go for either a highspeed USB3 stick, or other similar fast memory card to really get the benefit.
 
Plus the only other caveat is you dont get to choose which files get cached,if you play GTA5 enough and it can see the same file being accessed a lot you may get some good results, otherwise it'll just be used to cache OS objects. 

Unless you can setup some form of super raid array I would doubt it, same transfer speed as your internal drive (unless your rocking a 5400rpm)

Firstly how long have you waited while the black screen with cursor is shown, its possible that something is still being installed at that time and if your assuming the worst and hitting the reset button premature its never going to complete.
 
Secondly there have been known issues with the Nvidia driver supplied by Windows update, try if you can to install the driver from the Nvidia website instead. I would suggest getting everything running and windows updated using the onboard GPU first, then installing the Nvidia GPU and installing drivers.

Resetting my pc worked, thanks to everyone that helped!

[THIS PROBLEM HAS BEEN SOLVED, SOLUTION IN EDIT 2]
 
Hello, I just encountered a weird problem that I cant find a solution to.
After a lesson I came to power up my pc again and sfter I put my password in, I was greeted with a black screen and a system32 cmd prompt, I have a cursor and ctrl alt delete seems to work.
Things I tried:
Safe mode with networking, same result.
Restarting
Shutting down and powering up again
 
Thank you so much for any feedback and help, it means alot!
 
Edit: Typing explorer.exe in the system32 cmd prompt that pops up seems to worked, taskbar is back etc
 
Edit 2: Resetting (Not restarting, got them mixed up) my pc worked, everything back to normal.

This is also a possible and/or viable option. 

Currently resetting, and yeah I got abit confused between restart, reset and refresh, like I said, Im oretty young and not really computer-literate in these kind of things, sorry for bothering so much again.

As the reg key is correct then yes go for the reset, probably the only way to get back to a good clean working system.