>I created a database, named it 'test'.
>Then I selected this database -> Tasks -> Restore database.

I suggested to create a test database so you can double check to make sure your restore is ok, test it, before completely removing the actual one.

This restore script allows you to specify the test database:

USE Master
RESTORE DATABASE [Test] FROM DISK = N'D:\YourDirectory\YourSubDirectory\YourDatabase.bak'
 FILE = 1,  NOUNLOAD,  REPLACE,  STATS = 10
GO