Hi
Please don't be surprised in your findings.
Before I installed Malwarebytes on my WIN10 computer I got a threatening email form a hacker.
Windows defender did not find any problems, which is very unfortunate because in-fact there was a security problem.
At that point I tried Malwarebytes and Malwarebytes found number of threats.
Also, as you wrote, I also found logs on my laptop with whatever I typed in the past and I also located some txt files in my doc folder and the root C I never created.
The techsupport staff of Malwarebytes was great and recommended that I also run their other program: Adw Cleaner:
AdwCleaner - Free Adware Cleaner & Removal Tool | Malwarebytes
The AdwCleaner found some other threats which Malwarebytes did not find.
After removing all these threats I am OK.
After having the said above experience, I cannot trust anylonger to Windows Defender .
I also contacted Microsoft and reported all the above directly to a person responsible for Windows Defender operations.
This message is not an advertisement of Malwarebytes company. I just share my personal experience.
Thanks for reading all the above.