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function UsedWindowsVersion : String;
var OsVinfo : TOSVERSIONINFO;
begin
  ZeroMemory(@OsVinfo,sizeOf(OsVinfo));
  OsVinfo.dwOSVersionInfoSize := sizeof(TOSVERSIONINFO);

  if GetVersionEx(OsVinfo)
  then case OsVinfo.dwPlatformId of
    VER_PLATFORM_WIN32_WINDOWS: begin
                                  case OsVinfo.dwMinorVersion of
                                    00..09 : begin
                                               case OsVinfo.dwBuildNumber of
                                                 1111 : Result := '95 OEM Service Release 2';
                                                 1214 : Result := '95 OEM Service Release 2.5';
                                               else
                                                 Result := '95';
                                               end;
                                             end;
                                    10..49: begin
                                              if (UpperCase(OsVinfo.szCSDVersion[0]) = 'A') or (UpperCase(OsVinfo.szCSDVersion[1]) = 'A')
                                              then Result := '98 Zweite Ausgabe'
                                              else Result := '98';
                                            end;
                                    50..99: begin
                                              Result := 'Millennium Edition';
                                            end;
                                  else
                                    Result := 'Unbekanntes Betriebssystem';
                                    if SetOSIntegerToo then frm_Main.WinSystem := 0;
                                  end;
                                  Result :=  Result + ' (Version '+IntToStr(OsVinfo.dwMajorVersion)+'.'+IntToStr(OsVinfo.dwMinorVersion)+' Build '+IntToStr(OsVinfo.dwBuildNumber)+OsVinfo.szCSDVersion+')';
                                end;
    VER_PLATFORM_WIN32_NT: begin
                             case OsVinfo.dwMajorVersion of
                               4: begin
                                    Result := 'NT';
                                  end;
                               5: case OsVinfo.dwMinorVersion of
                                    0 : begin
                                          Result := '2000';
                                        end;
                                    1 : begin
                                          Result := 'XP';
                                        end;
                                  else
                                    Result := 'Unbekanntes Betriebssystem';
                                  end;
                             else
                               Result := 'Unbekanntes Betriebssystem';
                             end;
                             if Trim(OsVinfo.szCSDVersion) = ''
                             then Result :=  Result + ' (Version '+IntToStr(OsVinfo.dwMajorVersion)+'.'+IntToStr(OsVinfo.dwMinorVersion)+' Build '+IntToStr(OsVinfo.dwBuildNumber)+')'
                             else Result :=  Result + ' (Version '+IntToStr(OsVinfo.dwMajorVersion)+'.'+IntToStr(OsVinfo.dwMinorVersion)+' Build '+IntToStr(OsVinfo.dwBuildNumber)+', '+OsVinfo.szCSDVersion+')';
                           end;
  else
    Result := 'Unbekanntes Betriebssystem';
  end;
  Result := 'Microsoft Windows '+Result;
end;