Windows 7 Windows 7 Files Copy

[VinJunkie]

I am working on a Windows 7 issue. I am creating a trimmed version of Windows 7 for my client. In this process everything goes well till I create the trimmed version on a DVD and it also boots from the DVD. But the requirement is to copy the trimmed version OS files to a server and then it will be downloaded at some other location. I am facing an issue once I copy the trimmed os files on a hard drive it no longer remains bootable. Any idea behind such behavior of Windows 7? Any help is highly appreciated.