...die installierten Softwares auf einem Computer ermitteln?

uses
  Registry;
  
procedure TForm1.Button1Click(Sender: TObject);
const
  UNINST_PATH = 'SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall';
var
  Reg: TRegistry;
  SubKeys: TStringList;
  ListItem: TlistItem;
  i: integer;
  sDisplayName, sUninstallString: string;
begin
{
  ListView1.ViewStyle := vsReport;
  ListView1.Columns.add;
  ListView1.Columns.add;
  ListView1.Columns[0].caption := 'DisplayName';
  ListView1.Columns[1].caption := 'UninstallString';
  ListView1.Columns[0].Width := 300;
  ListView1.Columns[1].Width := 300;
}
  Reg := TRegistry.Create;
  with Reg do
    try
      with ListView1.Items do
        try
          BeginUpdate;
          Clear;
          RootKey := HKEY_LOCAL_MACHINE;
          if OpenKeyReadOnly(UNINST_PATH) then
          begin
            SubKeys := TStringList.Create;
            try
              GetKeyNames(SubKeys);
              CloseKey;
              for i := 0 to subKeys.Count - 1 do
                if OpenKeyReadOnly(Format('%s\%s', [UNINST_PATH, SubKeys[i]])) then
                  try
                    sDisplayName     := ReadString('DisplayName');
                    sUninstallString := ReadString('UninstallString');
                    if sDisplayName <> '' then
                    begin
                      ListItem         := Add;
                      ListItem.Caption := sDisplayName;
                      ListItem.subitems.Add(sUninstallString);
                    end;
                  finally
                    CloseKey;
                  end;
            finally
              SubKeys.Free;
            end;
          end;
        finally
          ListView1.AlphaSort;
          EndUpdate;
        end;
    finally
      CloseKey;
      Free;
    end;
end;