adventureworks attach error

i've attempt to atach the adventureWorks database to follow the webcourse 2924 but I got the following error:

TITLE: Microsoft SQL Server Management Studio

Attach database failed for Server 'localhost'. (Microsoft.SqlServer.Smo)

For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&ProdVer=9.00.2047.00&EvtSrc=Microsoft.SqlServer.Management.Smo.ExceptionTemplates.FailedOperationExceptionText&EvtID=Attach+database+Server&LinkId=20476

ADDITIONAL INFORMATION:

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

Could not find row in sysindexes for database ID 28, object ID 1, index ID 1. Run DBCC CHECKTABLE on sysindexes.
Could not open new database 'AdventureWorks'. CREATE DATABASE is aborted. (Microsoft SQL Server, Error: 602)

But, how can I run DBCC CHECKTABLE on non attached database?

For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&EvtSrc=MSSQLServer&EvtID=602&LinkId=20476

BUTTONS:

OK

Mary,

Please follow this article to attach AW.

http://msdn2.microsoft.com/en-us/library/ms310325.aspx