Информация об OS и о количестве памяти для окна About

type
  TAboutForm = class(TForm)
  OS: TLabel;
  Mem: TLabel;

...

procedure TAboutForm.GetOSInfo;
var
  Platform: string;
  BuildNumber: Integer;
begin
  case Win32Platform of
    VER_PLATFORM_WIN32_WINDOWS:
    begin
      Platform := 'Windows 95';
      BuildNumber := Win32BuildNumber and $0000FFFF;
    end;
    VER_PLATFORM_WIN32_NT:
    begin
      Platform := 'Windows NT';
      BuildNumber := Win32BuildNumber;
    end;
    else
    begin
      Platform := 'Windows';
      BuildNumber := 0;
    end;
  end;
  if (Win32Platform = VER_PLATFORM_WIN32_WINDOWS) or (Win32Platform = VER_PLATFORM_WIN32_NT) then
  begin
    if Win32CSDVersion = '' then
      OS.Caption := Format('%s %d.%d (Build %d)', [Platform, Win32MajorVersion, Win32MinorVersion, BuildNumber])
    else
      OS.Caption := Format('%s %d.%d (Build %d: %s)', [Platform, Win32MajorVersion, Win32MinorVersion, BuildNumber, Win32CSDVersion]);
  end
  else
    OS.Caption := Format('%s %d.%d', [Platform, Win32MajorVersion, Win32MinorVersion])
end;

procedure TAboutForm.InitializeCaptions;
var
  MS: TMemoryStatus;
begin
  GetOSInfo;
  MS.dwLength := SizeOf(TMemoryStatus);
  GlobalMemoryStatus(MS);
  Mem.Caption := FormatFloat('#,###" KB"', MS.dwTotalPhys div 1024);
end;