Installing the AdventureWorks Database

I've downloaded and installed the Adventure works database

I follow the instructions give here

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

but this command here:

exec sp_attach_db @dbname=N'AdventureWorks', @filename1=N'C:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\Data\AdventureWorks_Data.mdf', @filename2=N'C:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\Data\AdventureWorks_log.ldf'

results in this error:

"unable to open physical file,................................................. the system can't find the specified file."

AdventureWorks_log.ldf + AdventureWorks_Data.mdf ...................don't exist at this location:

c:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\Data\

i'm thinking of reinstalling the whole adventure works DB.

any ideas please