[Solved] Unexplainable bug in my code

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There are several issues with your code (using legacy APIs, using bad parameters, missing logic, etc).

Try something more like this instead:

#include <iostream>
#include <Windows.h>

const DWORD transparenton = 0x00000001;
const DWORD transparentoff = 0x00000000;

using namespace std;

void pause();
void act(HKEY key);
bool getTransparency(HKEY key, DWORD &value);
void setTransparency(HKEY key, DWORD value);

int main()
{
    cout << "\tStart Menu Blurrier\n";
    cout << "Make your Windows 10 start menu background blurry like in Windows 7\nAutomatic On/Off\n";
    pause();

    HKEY hKey;
    LONG result = RegOpenKeyExW(HKEY_CURRENT_USER, L"SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Themes\\Personalize", 0, KEY_QUERY_VALUE | KEY_SET_VALUE, &hKey);
    if (result == 0)
    {
        act(hKey);
        RegCloseKey(hKey);
    }
    return 0;
}

void pause()
{
    cout << "Press [ENTER] to continue...";
    cin.get();
    system("cls");
}

void act(HKEY key)
{
    DWORD value;
    if (getTransparency(key, value))
    {
        if (value == transparenton) {
            setTransparency(key, transparentoff);
        }
        else {
            setTransparency(key, transparenton);
        }
    }
}

bool getTransparency(HKEY key, DWORD &value)
{
    DWORD size = sizeof(value);
    LONG result = RegQueryValueExW(key, L"EnableBlurBehind", NULL, NULL, (BYTE*)&value, &size);
    if (result == ERROR_FILE_NOT_FOUND)
    {
        value = transparentoff;
        result = 0;
    }
    return (result == 0);
}

void setTransparency(HKEY key, DWORD value)
{
    RegSetValueExW(key, L"EnableBlurBehind", 0, REG_DWORD, (BYTE*)&value, sizeof(value));
}

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solved Unexplainable bug in my code