also, run the windows MSCONFIG program and examine both the 'services' and 'startup' tabs to see if anything related to 'px' and 'roxio' are present. if they are, disable/delete them.
also, using normal windows search, search entire computer for the term 'px' and delete all results which are found
perhaps also, using normal windows search, search entire computer for the term 'roxio' and delete all results which are found