I'm afraid Windows says you're stuck with those - essential system files, so called. If you don't store anything in them, they take up little space but in eth days of good old XP, all these things were configurable one way or another..
I want to delete the Contacts, Favorites and Searches folders in my main personal folder (the one where My Pictures/My Videos are). I can delete them or make them hidden but they just come back. Is there any way to delete them for good??