using (RegistryKey key = Microsoft.Win32.Registry.LocalMachine.OpenSubKey(@"Software\Microsoft\Windows\CurrentVersion\Uninstall", false))
{
    if (key != null)
    {
        foreach (string keyName in key.GetSubKeyNames())
        {
            using (RegistryKey key2 = key.OpenSubKey(keyName, false))
            {
                if (key2 != null)
                {
                    string softwareName = key2.GetValue("DisplayName", "").ToString();
                    string installLocation = key2.GetValue("InstallLocation", "").ToString();
                    if (!string.IsNullOrEmpty(installLocation))
                    {
                        this.textBox1.AppendText(string.Format("软件名：{0} -- 安装路径：{1}\r\n", softwareName, installLocation));
                    }
                }
            }
        }
    }
}