服务安装后事件 这样就可以了
private void serviceInstaller1_AfterInstall(object sender, InstallEventArgs e)
        {
            ManagementBaseObject inPar = null;
            ManagementClass mc = new ManagementClass("Win32_Service");
            foreach (ManagementObject mo in mc.GetInstances())
            {
                if (mo["Name"].ToString() == "KeyboardService")
                {
                    inPar = mo.GetMethodParameters("Change");
                    inPar["DesktopInteract"] = true;
                    mo.InvokeMethod("Change", inPar, null);
                }
            }      
  }*/

------解决方案--------------------

private void serviceInstaller1_AfterInstall(object sender, InstallEventArgs e)
       {
           ManagementBaseObject inPar = null;
           ManagementClass mc = new ManagementClass("Win32_Service");
           foreach (ManagementObject mo in mc.GetInstances())
           {
               if (mo["Name"].ToString() == "服务名")
               {
                   inPar = mo.GetMethodParameters("Change");
                   inPar["DesktopInteract"] = true;
                   mo.InvokeMethod("Change", inPar, null);
               }
           }     
 }*/