 Although WhenU's advertising software declares that it poses no risk of harm to users' computers, it is considered by many to be unwelcome because it serves pop-up advertisements and slows down the computer.Lavasoft's Ad-Aware and Computer Associates' PestPatrol briefly de-listed WhenU as an adware target in February 2005.Why these two programs stopped detecting WhenU while continuing to target other similar adware programs has led to some speculation of their reasoning.