"What a racket" is about right.
Windows 10 like all other MS operating systems before it is garbage. It may be more secure but it's still garbage.
(BitLocker again like all other MS encryption software is also garbage.)
A few years ago Norton's anti virus/Internet security software was shipping with new retail PCs. Total crap. All it did was slow down the computer.
AVAST is probably the best free anti virus software and Malwarebytes has gotten me out of trouble a few times over the years.
If you want to visit "naughty/pirate" sites have a dedicated PC that is used for nothing else with no personal info of any kind.
Opera is a good choice. I use it for most thing but the "Private Window"option work really well.
Just a clean build, update drivers and AVAST only. No Office products or any other software you've paid for.
You could use a KVM switch so you can use the same monitor, keyboard and mouse for two PCs.
Something like this is really cheap.