Hi oce. I would be checking my logs if I were you and use VirusTotal to check links that you click (if they are downloadable).

I don't think hiring a computer forensic expert is a good option in...

My guess is that "yahanna" isn't necessary proficient in using command line tools (and ssh) and there is some tinkering involved in setting up and using VNC, Filezilla. Many WINDOWS users are spoiled...

The app probably has SYSTEM permissions on you computer. Changing USER permissions will have no effect. On the other hand, if you block you app permissions to write to the folders (System) it is...

Check this Microsoft Link on Hide or uninstall OneDrive

a torrent client's web interface?