"Remove Server Farm Configuration Not Complete" Warning

The Central Admin URL should be part of Trusted Sites. Otherwise, many features will not work properly.

Go to Central Administration > Application Management > Check Services Enabled in this Farm
Clear the Errors logged here.

Once all the Errors are cleared in the above screenshot,

1. We need to create New Web Application (Root Web App).
2. We need to create a SSP (Shared Service Provider) for the farm.

If you don't see any other errors while going thru the process, this will help you to get rid of the above message.