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procedure TForm1.Button4Click(Sender: TObject); 
var reg:TRegistry; ergebnis:string; 
begin 
  reg:=TRegistry.Create; 
  reg.RootKey:=HKEY_LOCAL_MACHINE; 
  reg.OpenKey( '\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{061126FC-5424-41BA-8D05-3C30C0F153C7}', False); //Schlüssel öffnen 
  ergebnis:= reg.ReadString( 'DisplayName' ); //Wert auslesen 
  reg.Free; //Freigeben 
  edit1.text:=ergebnis; 
end;                    

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procedure TForm1.Button5Click(Sender: TObject); 
var 
  reg : TRegistry; 
begin 
  reg := TRegistry.Create(KEY_READ); 
  try 
    reg.RootKey := HKEY_LOCAL_MACHINE; 
    if reg.OpenKey('Software\Microsoft\Windows\Currentversion\Uninstall', FALSE) then 
    begin 
       reg.GetKeyNames(Listbox2.Items); 
    end 
    else 
      RaiselastOSError(); 
  finally 
    reg.Free; 
  end; 
end;                    

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procedure TForm1.Button5Click(Sender: TObject);
var
  reg: TRegIniFile;
  SoftList: TStringList;
  i: Integer;
  Name: String;
begin
  reg := TRegIniFile.Create;
  SoftList := TStringList.Create;
  try
    reg.RootKey := HKEY_LOCAL_MACHINE;
    if reg.OpenKey('Software\Microsoft\Windows\Currentversion\Uninstall', FALSE) then
    begin
      reg.ReadSections(SoftList);
      for i := 0 to SoftList.Count - 1 do
      begin
        Name := Reg.ReadString(SoftList[i], 'DisplayName', '');
        if Name <> '' then
         listbox2.items.add(name);
         memo1.lines.Add(Name);
      end;
    end;
  finally 
    SoftList.Free; 
    reg.Free; 
  end;
  ListBox2.Sorted := True;
end;