Hi AJ.
No i dont think i did delete the master folders.
i still have them , i deleted all that was inside them (i backed them up first).
what i wanted was a better overview because i am new to this type of thing, i wanted not to klatter up the display of files that i do not recognise.
i was a little kafuddled on looking for some menues but i found them at last(i re-installed os:4.0 then it was ok again.