[HELP] With Code

#include <windows.h> 
#include <tlhelp32.h> 
#include <cstdio> 

bool WriteMemValue(const char * ProcessName, LPVOID MemoryAddress, int NewVal, int size);

int main()
{
     printf("C++ Game Trainer\n"); 
     if(WriteMemValue("pes2011demo.EXE", (void*) 0x018ED5F4, 10, 4)) 
     {
          printf("Score changed successfully.\n"); 
      }
     else 
     {
          printf("Failed to edit score.\n"); 
      }
     system("PAUSE"); 
     return 0; 
}

bool WriteMemValue(const char * ProcessName, LPVOID MemoryAddress, int NewVal, int size)
{
         HANDLE hProcessSnap;
         HANDLE hProcess = NULL;
         PROCESSENTRY32 pe32;    
         hProcessSnap = CreateToolhelp32Snapshot( TH32CS_SNAPPROCESS, 0 );
         pe32.dwSize = sizeof( PROCESSENTRY32 );
       
         do
         {                
                  if(!strcmp(pe32.szExeFile, ProcessName))
                  {
                           hProcess = OpenProcess(PROCESS_VM_WRITE | PROCESS_VM_OPERATION, FALSE, pe32.th32ProcessID);
                           break;
                  }
         }
         while(Process32Next(hProcessSnap, &pe32));
         CloseHandle( hProcessSnap );
         if(hProcess != NULL)
         {
                  WriteProcessMemory(hProcess, MemoryAddress, &NewVal, size, NULL);                  
                  CloseHandle(hProcess);         
                  return true;
         }       
         return false;
}