syntax error identifier string.

[foobarbaz]

Hi,
I'm getting an error C2061: syntax error : identifier 'string'. Could you help me please?

class Person
{
public:
	Person(string stName);
	virtual void Print() const;
private:
	string m_stName;
};

#include <iostream>
#include <string>
#include "Person.h"

Person::Person(string stName)
:m_stName(stName)
{
	//Empty
}
void Person::Print() const
{
	cout << "Name: " << m_stName << endl;
}

#include <iostream>
#include "Person.h"
#include "Student.h"
#include "Employee.h"

using namespace std;

void main()
{
	Person person("John Smith");
	person.Print();
	cout << endl;
	Student student("Mark Jones", "MIT");
	student.Print();
	cout << endl;
	Employee emloyee("Adam Brown", "Microsoft");
	employee.Print();
	cout << endl;
	Person* pPerson = &person;
	pPerson->Print();		//calls print in person
	cout << endl;
	pPerson = &student;
	pPerson->Print();		//calls print in student
	cout << endl;
	pPerson = &emloyee;
	pPerson->Print();		//calls print in employee
}

thanks in advance for your help

[foobarbaz]

#include <iostream>
#include <string>
#include "Person.h"

namespace std;

Person::Person(string stName)
:m_stName(stName)
{
	//Empty
}
void Person::Print() const
{
	cout << "Name: " << m_stName << endl;
}

I noticed I forgot namespace std; but it still has the error

[foobarbaz]

I get about 500 errors from this project. Oh well maybe it was setup wrong. and its actually 81 errors