By MATTHEW CRAFTNEW YORK (AP) â¿¿ Rite Aid, Ross Stores and other retailers surged Thursday after turning in better sales, and major stock market indexes rose for a fourth day straight. The discount chain Ross Stores jumped 6 percent, the best gain in the Standard & Poor's 500 index. The company said stronger sales in March will likely push profits above its previous estimate this quarter. The stock jumped $3.56 to $63.80. A surprising drop in claims for unemployment benefits last week gave investors more encouragement. Analysts said it could mean a slowdown in hiring last month may have been temporary. "The numbers today make it seem like that March report was an anomaly," said David Heidl, a regional investment manager at U.S. Bank's wealth management unit. "It's another reason for optimism." The Dow Jones industrial average gained 62.90 points to close at 14,865.14, an increase of 0.4 percent. The Standard & Poor's 500 index rose 5.64 points, also 0.4 percent, to 1,593.37. Rite Aid soared 18 percent to $2.12 after the drugstore chain said higher sales of generic drugs and lower costs helped it post better earnings than analysts had expected. Makers of computer hardware and software sank following a report that first-quarter shipments of PCs dropped 14 percent worldwide over the past year. That's the steepest fall since International Data Corp. started tracking the industry in 1994. "The IDC report is much worse than anyone expected," said David Brown, director of Sabrient Systems, an investment research firm. "That's obviously shaking up the tech sector, but everything else is resuming the climb." The three companies in the Dow that deal in PCs held the index back. Hewlett-Packard dropped 6 percent to $20.88, Microsoft lost 4 percent to $28.93 and Intel fell 2 percent to $21.82. Without them, the Dow would have gained 25 more points.