我无法在xampp中启动apache：

Status change detected: stopped
    12:23:32  [Apache]  Error: Apache shutdown unexpectedly.
    12:23:32  [Apache]  This may be due to a blocked port,missing dependencies,12:23:32  [Apache]  improper privileges,a crash,or a shutdown by another method.
    12:23:32  [Apache]  Press the Logs button to view error logs and check
    12:23:32  [Apache]  the Windows Event Viewer for more clues
    12:23:32  [Apache]  If you need more help,copy and post this
    12:23:32  [Apache]  entire log window on the forums

我该如何解决？