Trying to attach a database to a new installatio of sql and getting an error

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

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For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&ProdVer=10.50.1600.1+((KJ_RTM).1004...

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Program Location:

at Microsoft.SqlServer.Management.Smo.Server.AttachDatabase(String name, StringCollection files)
at Microsoft.SqlServer.Management.SqlManagerUI.AttachDatabaseData.PrimaryFile.Attach()
at Microsoft.SqlServer.Management.SqlManagerUI.AttachDatabase.SendDataToServer()

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Cannot attach a database with the same name as an existing database. (Microsoft.SqlServer.Smo)