I have successful installed MOSS 2007, top level site and additional pages. When I tried to create an additional top level site, I inadvertently selected the same shared service account for the application pool that the SharePoint Central Administration pages(s) are on and now the central administration pages will not load. The web pages and application pool are still in IIS but I am getting the services unavailable page. The event log says: A failure was encountered while launching the process serving application pool SharePoint Central Administration v3'. The application pool has been disabled. And also The identity of application pool 'SharePoint Central Administration v3' is invalid, so the World Wide Web Publishing Service can not create a worker process to serve the application pool. Therefore, the application pool has been disabled. The other newly created site works normally. Any advice on this is greatly appreciated.

If you go into the IIS management console on the web server, you can open the list of application pools. You'll see that the application pool is disabled. You can try to start it again, but the chance is there that is disables itself again after loading the sharepoint site. you'll get a service unavailable again. If that happens, try to set the identity again of the applciation pool in IIS. (properties, identity...)Set theservice account again and reenter the password. After that start the application pool again and see what happens if you load the sharepoint site... I hope this helps, Mart

This normally happens when the Application pool account password expires or has been changed. For this you need to go to IIS Manager and go to the properties of the Website, and re-enter the Identity password. Recycle your application pool and then check if your Central Administration comes back online or not. If not, then report the error for further analysis.BR, PM