SEATTLE (AP) - A federal judge says consumers may go ahead with a class action lawsuit against Microsoft over the way it advertised computers loaded with Windows XP as capable of running the Vista operating system.

The lawsuit said Microsoft's labeling of some PCs as "Windows Vista Capable" was misleading because many of those computers were not powerful enough to run all of Vista's features, including the much-touted "Aero" user interface.

U.S. District Judge Marsha Pechman today in Seattle certified the class action suit, but whittled down its scope to focus primarily on whether Microsoft's "Vista Capable" labels created artificial demand for computers during the 2006 holiday shopping season, and inflated prices for computers that couldn't be upgraded to the full-featured version of Vista. It was released at the end of January 2007.

Microsoft says it's reviewing the ruling.