I agree they are system file but appeared after a F-Secure on line scanning........am I correct?
They have nothing to do with F-Secure.
Desktop.ini will save customization of each folder, like Folder picture etc.
Boot.ini, config.sys etc are windows configuration needed to boot windows
Recyler is where windows save file you move to recycle bin
System Volume information is clear from it's name...
Maybe F-Secure had impact on Windows Folder options settings and disabled "Hide Protected System Files"