Debugger process finished with exit code -1073741819 (0xC0000005) Follow

The debugger keeps stopping. In any C++ program I try to debug, I get this annoying message (Debugger process finished with exit code -1073741819 (0xC0000005)), which right after it, the debugger stops working and I have to rerun it again.

For example when I try to highlight that portion of the code - to evaluate it. After pressing right key I get the red pop-up message of the debugger stopped working.

and this is the code I was debugging.

<code>

#include<bits/stdc++.h>
using namespace std;

//Key values of a and b
const int a = 17;
const int b = 20;

string encryptMessage(string plainText)
{
    string cipher = "";

    for (int i = 0; i < plainText.length(); i++)
    {
        if(plainText[i]!=' ')
        {
            if ((plainText[i] >= 'a' && plainText[i] <= 'z') || (plainText[i] >= 'A' && plainText[i] <= 'Z'))
            {
                if (plainText[i] >= 'a' && plainText[i] <= 'z')
                {
                    cipher = cipher + (char) ((((a * (plainText[i]-'a') ) + b) % 26) + 'a');
                }

                else if (plainText[i] >= 'A' && plainText[i] <= 'Z')
                {
                    cipher = cipher + (char) ((((a * (plainText[i]-'A') ) + b) % 26) + 'A');
                }

            }
            else
            {
                cipher += plainText[i];
            }

        }
        else
        {
            cipher += plainText[i];
        }

    }
    return cipher;
}

string decryptCipher(string cipher)
{
    string plainText = "";
    int aInverse = 0;
    int flag = 0;

    for (int i = 0; i < 26; i++)
    {
        flag = (a * i) % 26;

        if (flag == 1)
        {
            aInverse = i;
        }
    }

    for (int i = 0; i < cipher.length(); i++)
    {
        if(cipher[i] != ' ')
        {
            if ((cipher[i] >= 'a' && cipher[i] <= 'z') || (cipher[i] >= 'A' && cipher[i] <= 'Z'))
            {
                if (cipher[i] >= 'a' && cipher[i] <= 'z')
                {
                    plainText = plainText + (char) ((((aInverse * (cipher[i]+ 'a') ) - b) % 26) + 'a');

                }

                else if (cipher[i] >= 'A' && cipher[i] <= 'Z')
                {
                    plainText = plainText + (char) (((aInverse * ((cipher[i]+'A' - b)) % 26)) + 'A');

                }

            }
            else
            {
                plainText += cipher[i];
            }
        }
        else

            plainText += cipher[i];
    }

    return plainText;

}

//Driver Program
int main(void)
{
    string msg = "abcdefghijklmnopqrstuvwxyz ABCDEFGHIJKLMNOPQRSTUVWXYZ";

    //Calling encryption function
    string cipherText = encryptMessage(msg);
    cout << "Encrypted Message is : " << cipherText<<endl;

    //Calling Decryption function
    cout << "Decrypted Message is : " << decryptCipher(cipherText);

    return 0;
}

</code>