The business news enterprise package planned through April 14. For comments or questions, call 212-621-1680. For questions about photos, call ext. 1900. For questions about graphics, call ext. 7636. Repeats of stories are available from http://apexchange.com or the Service Desk, 1-800-838-4616.

DIGITAL LIFE-TECH TIPS-WINDOWS XP

NEW YORK — People who continue to use Windows XP, first released in 2001, are opening themselves to security risks. If you're running XP, you have two choices: Secure it to minimize the threats or update your PC with a newer operating system. Here's how to do either. By Anick Jesdanun. SENT: Monday, 1,100 words.

CANADA-RETAILING

TORONTO — For years, Canadians would cross the border to the U.S. to shop at Target. Exporting its cheap chic there seemed like a no-brainer. Cracking the Canadian retail market, one-tenth the size of the United States', looks simple. But a year after opening more than 100 stores north of the border, Target has joined other U.S. retailers in learning that business isn't so easy. By Anne D'Innocenzio and Charmaine Noronha. SENT: Monday, 1,400 words, photos.

EXOTIC CAR RENTALS

LAS VEGAS — They're a chance for the middle class to feel like a movie star for a Vegas weekend. Or for a movie star to feel like a movie star away from home. In the past few years, some of the biggest car rental firms have added the finest autos money can buy to their fleet of practical Toyotas and Fords. And as the recession fades to a memory, the programs are seeing more customers take advantage of its Aston Martins and Lamborghinis. By Michelle Rindels. SENT: Monday, 840 words, photos.