C++ – Visual C++ not allowing iostream

I just started C++ I am reading the ebook Starting out with C++ 7th edition. I copied the code from the book and put it into Visual, under new project w32 console app with precompiled headers. Well When I use the iostream in the preprocessor directive line i get.. I searched around and do not understand why the iostream won't work, any help?

1>------ Build started: Project: dd, Configuration: Debug Win32 ------
1>  stdafx.cpp 1>  dd.cpp 1>c:\documents and settings\leon\my documents\visual studio 2010\projects\dd\dd\dd.cpp(24): fatal error
C1010: unexpected end of file while looking for precompiled header.
Did you forget to add '#include "StdAfx.h"' to your source?
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

    1 // This program calculates the user's pay.
    2 #include <iostream>
    3 using namespace std;
    4
    5 int main()
    6 {
    7 double hours, rate, pay;
    8
    9 // Get the number of hours worked.
    10 cout << "How many hours did you work? ";
    11 cin >> hours;
    12
    13 // Get the hourly pay rate.
    14 cout << "How much do you get paid per hour? ";
    15 cin >> rate;
    16
    17 // Calculate the pay.
    18 pay = hours * rate;
    19
    20 // Display the pay.
    21 cout << "You have earned $" << pay << endl;
    22 return 0;
    23 }