Answer: adware

AnswerCrossword Clue
ADWARE

Relative of spam

ADWARE

Pop-up generators

ADWARE

Producer of pop-ups

ADWARE
Program that generates online pop-ups
ADWARE
Program producing pop-ups
ADWAREOnline pop-up source
ADWAREPop-up producer
ADWAREInvasive apps
ADWAREProducer of Web pop-ups
ADWAREPop-up-producing program
ADWAREProgramming behind computer pop-ups
ADWARENorton AntiVirus target
ADWAREProgram producing online pop-ups
ADWAREInvasive software, perhaps
ADWAREProgram with popups, perhaps
ADWAREHard-drive infestation
ADWAREPrograms with popups, perhaps
ADWAREPop-up generator
ADWARESource of some pop-ups
ADWAREIt can dirty your Windows
ADWAREProgram with plugs