Moving MSDB database

When i am trying to shift msdb database from it's default path(C:\Program Files\Microsoft SQL Server\MSSQL10.SQLEXPRESS\MSSQL\DATA) to another drive(E:\). After shifting the database i am getting error as shown below.(the error i am getting while expanding database node in SSMS an d now i am not able to access any database.)

Failed to retrieve data for this request. (Microsoft.SqlServer.Management.Sdk.Sfc)

For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&LinkId=20476

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ADDITIONAL INFORMATION:

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

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Database 'msdb' cannot be opened due to inaccessible files or insufficient memory or disk space.  See the SQL Server errorlog for details. (Microsoft SQL Server, Error: 945)

For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&ProdVer=10.00.2531&EvtSrc=MSSQLServer&EvtID=945&LinkId=20476

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The procedure i followed to shift msdb database is as follows:

1. For each file to be moved, run the following statement.

 ALTER DATABASE msdb
 MODIFY FILE ( NAME = MSDBData , FILENAME = 'E:\MSDBData.mdf' )
 ALTER DATABASE msdb
 MODIFY FILE ( NAME = MSDBLog , FILENAME = 'E:\MSDBLog.ldf' )

2. Stop the instance of SQL Server to perform maintenance.
3. Move the file or files to the new location.
4. Restart the instance of SQL Server or the server.

Also i did confirm the path by running following query

    SELECT name, physical_name AS CurrentLocation, state_desc

    FROM sys.master_files

    WHERE database_id = DB_ID(N'msdb');

And output was showing current location of both MSDBdata and MSDBLog as E:\

This error happened while i did it for testing server. I want to do it for a production server. So please help me on this error. How exactly to shift msdb database?