A California lawyer is trying to organise a class-action lawsuit against Microsoft, saying the company is engaging in unfair business practices in violation of state law because it has failed to secure its software against worms and viruses. The suit was filed in Los Angeles on behalf of a woman who is seeking undisclosed damages and an order requiring Microsoft to improve its security notification system, which has been a constant target of criticism from end users. The woman says her name and Social Security number were stolen and used fraudulently by someone who hacked into her computer. Dana Taschner, a Newport Beach, California, lawyer who filed the suit, wants to expand it into a class-action case against Microsoft. Traditionally, software makers have been shielded from such legal actions because of licensing agreements that software users sign. Microsoft said it is reviewing the complaint.