C ++ error while opening file

when i try to open the file for reading in my console application i get this error message: "Unhandled exception at 0x1048766d (msvcp90d.dll) in homework1.exe: 0xC0000005: write location of access violation 0x00000000". It works great when I compile and run the program on my macbook, but when I run it on my desktop using VS 2008, it gives me this error.

here is my code:

int main (void) {



    // Open 1st file (baseproduct.dat)
    ifstream fin;
    //fin.open (filename.c_str ());
    fin.open ("baseproduct.dat");

    int tries;
    tries = 0;
    while (fin.bad ())
    {
        if (tries> = 4)
        {
            cout> filename;
        fin.open (filename.c_str ());

        tries ++;

    }

    SodaPop inventory [100];

    // read file into array
    string strName;
    double dblPrice;
    int i;
    i = 0;
    fin >> strName;
    while (! fin.eof ())
    {
        inventory [i] .setName (strName);

        fin >> dblPrice;
        inventory [i] .setPrice (dblPrice);

        fin >> strName;
        i ++;
    }
    fin.close ();

    cout> filename;

    //fin.open (filename.c_str ());
    fin.open ("soldproduct.dat");

    tries = 0;
    while (fin.bad ())
    {
        if (tries> = 4)
        {
            cout> filename;
        fin.open (filename.c_str ());

        tries ++;

    }

    // read file into array
    i = 0;
    fin >> strName;
    while (! fin.eof ())
    {
        cout> dblPrice;
        inventory [i] .setPrice (dblPrice); * /

        fin >> strName;
        i ++;

        //1. search array for name
        // 2. get price (what should happen with it?)
        // 3. add # sold to quantity
    }
    fin.close ();
cout