After downloading, it's time to integrate the service pack on the XP CD. In order to do this, the large file needs to be unpacked. Unpacking is controlled by the special parameter /x, for which you need the DOS prompt:
Run (Execute) | cmd opens the DOS prompt
After the prompt has been opened, you need to switch to the SP directory. This is done with the command cd \WIN_CD\SP. After this, the service pack installation is started with the parameter /x . The complicated filename does not need to be typed in; just pressing the Tab key will insert the filename into the window.