Why am I getting this error in Visual Studio 2012 C++?

here's the exact code copied and pasted:

#include <iostream>

using namespace std;

int main()

{

int temp;

string first;

cout << "Enter first name: ";

cin >> first ;

return 0;

}

i'm dumbfounded and really annoyed. i attached a picture. in case you can't see the pic, i'm getting and error on the ">>" and the error says:

Error: no operator ">>" matches these operands. operand types are: std::istream >> std::string