After using "clean and fix my computer" from jv16pt2011, I see a list of history data, temp files and empty folders to delete.
I don't know what to do with the list of empty folders. For example, one is related with Windows (microsoft\credentials\, one with Eset (my antivirus), one with Guitar Pro 6 (....\Guitar Pro 6\my presets\
Can they really be deleted without harming the system?