installing windows 7/8 from within a directory

Hi
I'm tring to install windows 7/8 from within a directory
(i.e. I have 2 directories inside the root of my grub4dos hdd - Windows7 and Windows8, each one contains the installation files)

I tried:
title Install Windows8
root (hd0,0)/Windows8
chainloader /bootmgr

but I end with the following error:

    Windows failed to start. A recent hardware or software change might be the 
cause. To fix the problem:

    1. Insert your Windows Installation disc and restart your computer.
    2. Choose your language settings and then click "Next"
    3. Click "Repair your computer"
    If you do not have this disc, contact your system administrator or computer 
manufacturer for assistance.

    File: \Boot\BCD

    Status: 0xc000000f

    Info: the boot configuration data for your pc is missing or contains errors.

   
When I put the installation files on a different partition - it works, so my installation directory is not corrupted.

Any idea?

Thanks!