protected static bool IsInstalledRegistry(string program)
{
RegistryKey[] keys = new RegistryKey[] {
Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall"),
Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall"),
Registry.ClassesRoot.OpenSubKey(@"Local Settings\Software\Microsoft\Windows\CurrentVersion\AppModel\Repository\Packages"),
};
return(keys.Any(key => key != null && CheckRegistryKey(key, "DisplayName", program)));
}