Estou tentando desinstalar um programa com esse código .. Mas parece que não funciona. Eu tentei as outras respostas, mas também não pareceu funcionar. Alguém pode me ajudar com isso? Estou tentando desinstalar o programa com um nome determinado (displayName)

Por exemplo, eu dou o displayName = Appname, esse código deve desinstalar o programa Appname do meu computador.

public static void UninstallApplictionInstalled(string p_name)
    {
        string displayName;
        string uninstlString;
        RegistryKey key;

        ProcessStartInfo info = new ProcessStartInfo();
        Process uninstallProcess = new Process();
        string temp;

        // search in: CurrentUser
        key = Registry.CurrentUser.OpenSubKey(@"SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall");
        foreach (String keyName in key.GetSubKeyNames())
        {
            RegistryKey subkey = key.OpenSubKey(keyName);
            displayName = Convert.ToString(subkey.GetValue("DisplayName"));
            uninstlString = Convert.ToString(subkey.GetValue("UninstallString"));

            if (p_name.Equals(displayName, StringComparison.OrdinalIgnoreCase) == true)
            {

                uninstallProcess.StartInfo.FileName = "MsiExec.exe";
                uninstallProcess.StartInfo.Arguments = " /x " + uninstlString + " /quiet /norestart";
                uninstallProcess.Start();
                uninstallProcess.WaitForExit();
                break;

                //Console.WriteLine(subkey.GetValue("UninstallString"));
            }
        }

        // search in: LocalMachine_32
        key = Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall");
        foreach (String keyName in key.GetSubKeyNames())
        {
            RegistryKey subkey = key.OpenSubKey(keyName);
            displayName = Convert.ToString(subkey.GetValue("DisplayName"));
            uninstlString = Convert.ToString(subkey.GetValue("UninstallString"));

            if (p_name.Equals(displayName, StringComparison.OrdinalIgnoreCase) == true)
            {
                uninstallProcess.StartInfo.FileName = "MsiExec.exe";
                uninstallProcess.StartInfo.Arguments = " /x " + uninstlString + " /quiet /norestart";
                uninstallProcess.Start();
                uninstallProcess.WaitForExit();
                break;

                //Console.WriteLine(subkey.GetValue("UninstallString"));
            }
        }

        // search in: LocalMachine_64
        key = Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall");
        foreach (String keyName in key.GetSubKeyNames())
        {
            RegistryKey subkey = key.OpenSubKey(keyName);
            displayName = Convert.ToString(subkey.GetValue("DisplayName"));
            uninstlString = Convert.ToString(subkey.GetValue("UninstallString"));

            if (p_name.Equals(displayName, StringComparison.OrdinalIgnoreCase) == true)
            {
                //string prdctId = uninstlString.Substring((uninstlString.IndexOf("{")));

                uninstallProcess.StartInfo.FileName = "MsiExec.exe";
                uninstallProcess.StartInfo.Arguments = " /x " + uninstlString + " /quiet /norestart";
                uninstallProcess.Start();
                uninstallProcess.WaitForExit();
                break;
                //Console.WriteLine(subkey.GetValue("UninstallString"));
            }
        }
      }

Apenas isso aparece ..