SPS encounters an error, how can it work?

When I installed SPS2003 (English version), nothing error happens,and then configure server.

 

In Portal Site and Virtual Server Configuration

Create a portal site

When I clicked this link, system display following error:

You can create portals only on servers that are running the Web component for SharePoint Portal Server. This component is not active on this server. To activate the Web component on this server, go to the Configure Server Topology page.

 

Then I follow this guide, I go to Configure Server Topology page.

In this page, it says:

Problems with this Configuration

View current configuration issues with this deployment.

Critical Issues:

No job server has been specified.

The search component is not running anywhere. The portal sites will not be able to search.

The index component is not running anywhere. Search results will become out-of-date.

The front-end web server is not running anywhere. No users will be able to access the sites.

The current topology is not supported.

 

Warnings:

Server My****** is unused.