components installation

I am just a novice, and am curious.I

I was trying subscription, but an error occured: "Microsoft Server Management Studio is un able to accessreplication components because replication is not installed on this instance.

I went to change, located my setup exe, installed. but at the end, I get this message: No selected features can be installed or upgraded. Setup cannot proceed since no effective change is being made to the machine......

I downloaded the Express edition via MSDN download.

May somebody please help? What wrong did I do? What did I miss to do?

[606 byte] By [jimurbano] at [2007-12-24]