Install IIS on Windows XP Professional - Step II
If IIS is not installed, it is a very simple operation to install it. You will need to have the Windows XP Professional installation CD-ROM handy.
1. Click Start > Control Panel > Add or Remove Programs.
2. When the Add or Remove Programs window opens select Add/Remove Windows Components.

3. When the Windows Component Wizard window opens, click on Internet Information Services (IIS) and then click on the Details... button.

4. When the Internet Information Services window opens, go ahead and check all of the blocks (you never know, you might want to use them in the future). Be sure to scroll all the way to the bottom.

5. Click OK.
6. Click Next on the Windows Component Wizard and the installation should start.
7. After installation (and restarting your computer, as needed), open Internet Explorer (or your browser of choice) and type the following in the address bar:
http://localhost or http://127.0.0.1
Two windows should open. One of the windows is the Welcome to Windows XP Server Internet Services. The other window is the Microsoft Internet Information Services 5.1 Documentation.
That's all there is to installing IIS on Windows XP Professional.