By default, Windows XP does not come with IIS installed, so you need to insert the installation CD and choose to install it again. This brings great inconvenience to everyone when debugging dynamic web page programs, as it's impractical to always carry a Windows XP installation disc around. Thanks to Zhen Shuiwuxiang for providing the download link of the IIS 5.1 installation package in their online storage. The program is extracted from Windows XP SP2 and is very convenient to use.