Try a full format - see if that gets rid of everything.
In regards to the 'Paul account', sounds like someone may have set up a backdoor with an account for themselves. Is it an Administratior account? If it's only a 'limited account', there shouldn't be any serious problems. If, however, it
is an Admin account, well that could be a worry (to say the least).
I'm not sure how to fix it, or find out how it got there (I'm still learning myself

), but this may be what has happened.