I recently purchased the new anti vrius software 'Panda Security'

It will not let me install this when norton antivirus is still on my system. Norton ran out a long time ago now but for some reason i cannot get all traces of it off my laptop before i install Panda.

I've tried to install panda already but it will not let me as Norton has been recognised as still being on here!

Any suggestions would be appreciated!

Many thanks