Getting error in attach AdventuresWorks database in SQL Server (Using window 7)

I am newbie in Sql Server.I am trying to attach AdventureWorks database with Sql Server 2008(Window 7).following Error -

Can anyone tell me that how I can solve this problem?

Thanks in advance.

This is the installer package (msi). You must run it from explorer firstly.

You are trying to attach AdventureWorksDB.msi. First run this msi file, it will extract its contents somewhere. Then you will need to attach a file with extension .mdf.