Norton antiVIRUS is Spam

So I log onto the computer, my mother has just finished using it, ready to get some homework done, when Norton antiVIRUS pops up with a message, saying it has taken a file, moved it to Quanantine so I have no idea whatit is, and deleted it, because it might have been a virus. After going through about 100 of these messages, I go to the quarantine folder to find TWENTY-NINE GIGS OF TINY ONE KB FILES!!!! How these appeared in then hour my mother used the computer, I don't know, because it takes me a couple days to download just a gig of data. I am currently deleting all the files; after that goes the Norton Virus. Of course, when I tried to delete it before, it told that me (the computer admin) did not have permission to delete it. This really pisses me off. I control my computer, it doesn't control me.