новый при использовании для петель

Это решение «все-в-одном», которое будет охватывать системы x32 / x64 и приложения для захвата, установленные на локальной машине или учетной записи пользователя.

    public class InstalledProgramInfo
    {
        public string name;
        public string path;
    }

        public static InstalledProgramInfo FindInstalledApp(string findname, bool dump = false)
    {
        if (String.IsNullOrEmpty(findname)) return null;

        string uninstallKey = @"SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall";

        RegistryHive[] keys = new RegistryHive[] { RegistryHive.CurrentUser, RegistryHive.LocalMachine };
        RegistryView[] views = new RegistryView[] { RegistryView.Registry32, RegistryView.Registry64 };

        foreach (var hive in keys)
        {
            foreach (var view in views)
            {
                RegistryKey rk = null, 
                    basekey = null;

                try
                {
                    basekey = RegistryKey.OpenBaseKey(hive, view);
                    rk = basekey.OpenSubKey(uninstallKey);
                }
                catch (Exception ex) { continue; }

                if (basekey == null || rk == null) 
                    continue;

                if (rk == null)
                {
                    if (dump) Console.WriteLine("ERROR: failed to open subkey '{0}'", uninstallKey);
                    return null;
                }

                if (dump) Console.WriteLine("Reading registry at {0}", rk.ToString());

                foreach (string skName in rk.GetSubKeyNames())
                {
                    try
                    {
                        RegistryKey sk = rk.OpenSubKey(skName);
                        if (sk == null) continue;

                        object skname = sk.GetValue("DisplayName");

                        object skpath = sk.GetValue("InstallLocation");
                        if (skpath == null)
                        {
                            skpath = sk.GetValue("UninstallString");
                            if (skpath == null) continue;
                            FileInfo fi = new FileInfo(skpath.ToString());
                            skpath = fi.Directory.FullName;
                        }

                        if (skname == null || skpath == null) continue;

                        string thisname = skname.ToString();
                        string thispath = skpath.ToString();

                        if (dump) Console.WriteLine("{0}: {1}", thisname, thispath);

                        if (!thisname.Equals(findname, StringComparison.CurrentCultureIgnoreCase))
                            continue;

                        InstalledProgramInfo inf = new InstalledProgramInfo();
                        inf.name = thisname;
                        inf.path = thispath;

                        return inf;
                    }
                    catch (Exception ex)
                    {
                        // todo
                    }
                }                   
            } // view
        } // hive

        return null;
    }