Trying to Disable/Delete Publishing and Distribution

I tried creating a Peer to Peer Replication on SQL Server 2008. I am trying to Delete or disable ir but I get the following error:
I tried the solution provided here but it didnt work for me.

I checked permissions on the user and have given complete control to the user.

Disabling Distribution...

- Disabling publishing and distribution (Error)
SQL Server could not disable publishing and distribution on 'prtrwebserver'. (Microsoft.SqlServer.ConnectionInfo)


An exception occurred while executing a Transact-SQL statement or batch. (Microsoft.SqlServer.ConnectionInfo)


Cannot execute as the database principal because the principal "dbo" does not exist, this type of principal cannot be impersonated, or you do not have permission.
Changed database context to 'master'. (Microsoft SQL Server, Error: 15517)

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Check the sp_dropdistributor @no_checks = 1

Before executing please check the details of this sp here:

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isaackhaziAuthor Commented:

 where do I find and check this?
isaackhaziAuthor Commented:
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Microsoft SQL Server

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