corrupted io.h

Hello all, I am trying do simple input/output in assembly language but keep getting the error
Deleting intermediate and output files for project 'windows32', configuration 'Debug|Win32'
Assembling...
Assembling: ..\PeachesAssembly\Ex_3_5_1.asm
C:\Program Files\Microsoft Visual Studio 9.0\VC\include\io.h(3) : error A2044:invalid character in file
C:\Program Files\Microsoft Visual Studio 9.0\VC\include\io.h(4) : error A2044:invalid character in file
C:\Program Files\Microsoft Visual Studio 9.0\VC\include\io.h(5) : error A2044:invalid character in file
C:\Program Files\Microsoft Visual Studio 9.0\VC\include\io.h(6) : error A2044:invalid character in file
C:\Program Files\Microsoft Visual Studio 9.0\VC\include\io.h(7) : error A2044:invalid character in file

here is my code

;Example assembly language program that adds two numbers
.586
.MODEL FLAT 
   
INCLUDE io.h

.STACK 4096

.DATA
  number1    DWORD   ?
  number2    DWORD   ?
  prompt1    BYTE    "Enter the first number ",0
  prompt2    BYTE    "Enter the second number ",0
  string     BYTE    40 DUP (?)
  resultLbl1 BYTE    "The sum is ",0
  sum        BYTE    11 DUP (?) 
   
.CODE
   _MainProc  PROC 
        input  prompt1,     string,  40          ;read ASCII characters
        atod   string                           ;convert string to integer
        mov    number1,     eax                 ;store in memory
        
        input  prompt2,     string, 40          ;repeat for second number
        atod   string 
        mov    number2,     eax 
        
        mov    eax,         number1             ;first number to EAX
        add    eax,         number2             ;add second number
        dtoa   sum,         eax                 ;convert to ASCII characters
        output resultLbl1,  sum                 ;output label and sum
        
        mov    eax,         0                   ;exit with return code 0
        ret
   _MainProc ENDP
END                                             ;end of source code

When I click open the io.h file under the header folder (I am using a windows32 template for GUI application, so input/output is via windows dialog box, instructor recommended this) Visual Studio 2008 says it cannot open the file, but when I double click the first error message the io.h file does open and it stops on this line of code

#if _MSC_VER > 1000

in fact everywhere there is a "#" there is also an error message
Is there a way to fix this? This code comes from a book called "Introduction To 80x86 Assembly Language and Computer Architecture" by Richard C. Detmer figure 3.10 page 69
I am on a windows PC using Windows 7
Any Ideas? Anyone?