Sql server 2008 - server name changed

I have changed the computer name of the server where sql server 2008 r2 is installed. Old name was WIN-OUJEKRMGXXX and new server name is KASURDYYY When i configure replication following error occurs:

SQL Server Replication requires actual server name to make a connection to the server ... Specify the actual server name, WIN-OUJEKRMGXXX

I updated the server name in sql server in order to resolve the issue. i run following queries

sp_dropserver WIN-OUJEKRMGXXX
sp_addserver KASURDYYY, local

but still same error occurs

I checked the server name :

select @@SERVERNAME returns value WIN-OUJEKRMGXXX
select SERVERPROPERTY('SERVERNAME') returns value KASURDYYY