I need to Start and Stop Window Services using Test complete J script?

CSL, try the following code - does it work? Also, try running TestComplete as administrator.

function Test()
{
  let computerName = ".";
  let serviceName = "WSearch"; // Service name is what's displayed in the Task Manager > Services > Name column

  // Use "" if local computer, otherwise use a domain account, e.g. "DOMAIN\\user"
  let userName = "";
  let password = "";

  StartService(computerName, serviceName, userName, password);
  Delay(5000);
  StopService(computerName, serviceName, userName, password);
}

function StartService(computerName, serviceName, userName = "", password = "")
{
  let service = GetService(computerName, serviceName, userName, password);
  if (service == null) {
    Log.Warning(`The '${serviceName}' service was not found on the '${computerName}' computer.`);
  }
  else {
    let status = service.StartService();
    if (status == 0) {
      Log.Message(`Started the '${serviceName}' service on the '${computerName}' computer.`)
    }
    else {
      // For the error codes, see https://msdn.microsoft.com/en-us/library/aa393660(v=vs.85).aspx
      Log.Message(`Could not start the '${serviceName}' service on the '${computerName}' computer. Error ${status}.`);
    }
  }
}
 
function StopService(computerName, serviceName, userName = "", password = "")
{
  let service = GetService(computerName, serviceName, userName, password);
  if (service == null) {
    Log.Warning(`The '${serviceName}' service was not found on the '${computerName}' computer.`);
  }
  else {
    let status = service.StopService();
    if (status == 0) {
      Log.Message(`Stopped the '${serviceName}' service on the '${computerName}' computer.`)
    }
    else {
      // For the error codes, see https://msdn.microsoft.com/en-us/library/aa393673(v=vs.85).aspx
      Log.Message(`Could not stop the '${serviceName}' service on the '${computerName}' computer. Error ${status}.`);
    }
  }
}

function GetService(computerName, serviceName, userName = "", password = "")
{
  let Locator = getActiveXObject("WbemScripting.SWbemLocator");

  // https://msdn.microsoft.com/en-us/library/aa393720(v=vs.85).aspx
  let wmiService = Locator.ConnectServer(computerName, "root\\cimv2", userName, password);

  //objectsList = wmiService.ExecQuery(`SELECT * FROM Win32_Service WHERE Name='${serviceName}'`);
  let service = null;
  try {
    service = wmiService.Get(`Win32_Service.Name='${serviceName}'`);
  }
  catch (e) {
    // Object not found, or missing permissions, or another error.
    // Error code is e.COMExceptionInfo.scode
    // See the error codes in https://msdn.microsoft.com/en-us/library/aa393868(v=vs.85).aspx
    Log.Error(e);
  }

  return service;
}

Thank you Helen, upgrading to Test Complete ver 12.40 fixed my issue.