I had a problem with avast premium so decided to uninstall it and reinstall but when I try to reinstall I get a message saying avast premium is still installed and to uninstall it.I have looked through every thing in the files folder and downloads but cannot see any trace of avast, tried the instruction from one of the members suggestion to go into terminal and type out his instructions but after doing so it came up with a line saying no directory exists. Can anyone help please.