Motherboard (Asus Hero VIII) had a fit. Nothing would work. I even unplugged all disks and still it would not let me get into BIOS.
Asus tools to get into BIOS did not work.
I ended up removing the...

I can't get into BIOS anymore.
I don't see "Press F2 or del to enter BIOS" anymore! It just goes into windows immediately!

I read lots of threads about high cpu usage by explorer, 95% of the users had samsung SSD 840 or 850. (and so do I)
My other Win10 computer does not have problems.

I did not install Samsung...

Same problem here.
1) Disabling Windows defender and indexing sped up copying 3 times.
2) After copying is done explorer.exe is stuck using about 40% of the CPU
3) Killing Explorer.exe instantly...