Wall Street closed Friday with losses for the fourth straight week as investors pulled out of the market on growing fears that both the U.S. and Europe face a recession. Hewlett-Packard's poor forecast caused its stock to drop nearly 20 percent Friday, its worst single day since the stock-market crash of 1987. The company announced Thursday it may spin off its PC business, the biggest in the world. Stocks also took a hit from the news that the S&P index dropped 13.1 percent and was on track to have its worst month since October 2008. "What I'm seeing right now is basically a crisis of confidence, more so than economic crisis or financial crisis necessarily at this stage," said analyst Natalie Trunow.