function checkVCRedist() {
    $missingPackages = array();
    
    // Check for x64 version
    if (!file_exists('C:\\Windows\\System32\\msvcp140.dll')) {
        $missingPackages[] = 'VC_redist.x64.exe';
    }
    
    // Check for x86 version
    if (!file_exists('C:\\Windows\\SysWOW64\\msvcp140.dll')) {
        $missingPackages[] = 'VC_redist.x86.exe';
    }
    
    return $missingPackages;
}

$missingPackages = checkVCRedist();

if (!empty($missingPackages)) {
    echo "<script>alert('Please install the following Visual C++ Redistributable packages:\\n";
    echo implode("\\n", $missingPackages);
    echo "');</script>";
    
    // Optionally, provide download links
    echo "<p>Download the missing packages below. If you do NOT install privileges, contact IT department:</p>";
    echo "<ul>";
    foreach ($missingPackages as $package) {
        echo "<li><a href='https://aka.ms/vs/17/release/$package'>$package</a></li>";
    }
    echo "</ul>";
} else {
    echo "<p>Visual C++ Redistributable packages are already installed.</p>";
}