The software company was alone responsible for more than two-thirds of the S&P 500's drop. NEW YORK (AP) — The worst day for Microsoft in years is yanking the U.S. stock market away from its record heights on Thursday. Gold and silver prices meanwhile, are swinging sharply following their jaw-dropping runs. The S&P 500 sank 0.7% after flirting with its all-time high earlier in the morning. The Dow Jones Industrial Average was down 101 points, or 0.2%, as of 1:29 p.m. Eastern time, and the