There are a variety of ways to install an OS over a network. Simply copying the CD to a shared folder isn't really one of them.
I would recommend you look into RIS (Remote Installation Services) or the replacement for it in Server 2003 R2 is Windows Deployment Service. You need to have a PC capable of PXE booting, and have an automated answer file setup and linked to the image of the OS to install. It isn't that hard to get working for a basic install.
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