NEW YORK, Oct 23 (Reuters) - The Dow and the S&P 500 indexes moved lower on Friday as a brief boost from September existing home sales data evaporated, and gains in the U.S. dollar diminished the appetite for riskier assets.
* The Nasdaq clung to a slight gain, however, after Microsoft Corp posted quarterly earnings above Wall Street's consensus estimate.
* The Dow Jones home construction index slipped 0.2 percent. It had risen by more than 1 percent following the housing data.
* The Dow Jones industrial average dropped 48.37 points, or 0.48 percent, to 10,032.94. The Standard & Poor's 500 Index dropped 5.36 points, or 0.49 percent, to 1,087.55. The Nasdaq Composite Index gained 8.59 points, or 0.40 percent, to 2,173.88.