Shares of Microsoft (NASDAQ:MSFT) dropped more than 4 percent on Thursday and continue to attract attention in late afternoon hours. According to IDC, global PC shipments declined 13.9 percent year-on-year to 76.3 million units in the first quarter of 2013, nearly doubling the firms predicted decline. The deep slide is the worst recorded since the firm began tracking shipments in 1994. Microsoft also received a downgrade from Goldman Sachs. Hewlett-Packard (NYSE:HPQ) shares plunged 6.4 percent on Thursday.