1:
2:
3:

reg := TRegistry.Create(KEY_READ); // <-- aha! #1
{ ... }
if(reg.OpenKey('...',FALSE)) then // <-- aha! #2					

1:
2:

DisplayName
UninstallString					

1:
2:

QuietDisplayname
QuietUninstallString					

1:
2:
3:
4:
5:
6:
7:

var reg: TRegistry;
begin
reg := TRegistry.Create(KEY_READ); // <-- aha! #1
{ ... }
if(reg.OpenKey('HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Uninstall',false)) then
exit;
reg.GetKeyNames(???);					

1:

if(reg.OpenKey('...',false)) then exit;					

1:
2:
3:
4:

if(reg.OpenKey('...',false)) then
  begin
    // Schlüsselnamen auslesen, usw.
  end;					

1:
2:
3:
4:
5:
6:
7:
8:
9:
10:
11:
12:
13:
14:
15:
16:
17:
18:
19:
20:

 
procedure TForm1.Button1Click(Sender: TObject);
var
  reg: TRegistry;
  bResult: Boolean;
begin
  reg := TRegistry.Create(KEY_READ);
  try
    reg.RootKey := HKEY_LOCAL_MACHINE;
    bResult := reg.OpenKey('Software\Microsoft\Windows\CurrentVersion\Uninstall',false);
    if bResult = FALSE then
    begin
      reg.Free;
      exit;
    end;
    reg.GetKeyNames(Listbox1.Items);
  finally
    reg.Free;
  end;
end;					

1:
2:
3:
4:
5:

if(reg.OpenKey('Software\Microsoft\Windows\CurrentVersion\Uninstall',false)) then
  begin
    reg.GetKeyNames(Listbox1.Items);
    reg.CloseKey;
  end;					

1:
2:
3:
4:
5:
6:
7:
8:
9:
10:
11:
12:
13:
14:

if(reg.OpenKey('...',false)) then
  begin
    // Software ist sichtbar
    if(reg.ValueExists('DisplayName')) then
      Listbox1.Items.Add(reg.ReadString('DisplayName')
    // Software ist nicht sichtbar
    else if(reg.ValueExists('QuietDisplayName')) then
      Listbox1.Items.Add(reg.ReadString('QuietDisplayName');

    // ggf. noch "UninstallString" bzw. "QuietUninstallString"
    // für eine evtl. Deinstallation lesen und anzeigen

    { ... }
  end;