Vista at one year: Progress and pain

xpvistasigntwo Microsoft released Windows Vista to the world one year ago with ads likening the new PC operating system to such awe-inspiring moments as the first American spaceflight and the fall of the Berlin Wall.

Microsoft Chairman Bill Gates recently called Windows Vista the "best new product of the year." The company says more than 100 million copies of the operating system have been licensed since it became available. Outside experts say Windows Vista is a major advance in security, and some users say their experience has been smooth.

But a year after its glitzy retail launch, Windows Vista has developed a reputation as a source of frustration for others.