yes, it is folder heirarchy is changed in SQL 2005.

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft SQL Server\MSSQL.1\MSSQLServer\SuperSocketNetLib\Tcp\IPAll\TcpPort

It contains one folder with spaces (Microsoft SQL Server) and now master.dbo.xp_instance_regread is giving error there. I tried to put single quote, double quote, all types of braces but none of them worked.

Anybody knows how to resolve this?