Kids keep messing up the mrs' computer-downloading infected files, changing internet explorer to fire fox and messing up all the files etc. Now I know you can block applications with a firewall but how can you block certain applications prior to them even being installed. Similalrly how could you stop someone diabling IE in favour of Firefox. The problem being the mrs allows her daughter to use the computer and it seems the daughter's boyfriend has an hand in this also ? Thank you