BRIEF-HP shares down 7.1 pct after it says 2013 to be challenging yr

NEW YORK, Oct 3 (Reuters) - Hewlett-Packard Co :

* Shares were down 7.1 percent, hitting their lowest since April 2003, after it said fiscal 2013 will be a challenging year for the company, and that it expects revenue to decline year over year in all segments except software in 2013.

((Caroline Valetkevitch, Wall Street Newsdesk Telephone: +1 646-223-6393))