Can you get the image onto a working pc with win 7?
Just copy the vhd file .
On the working pc, open disk management,click Action>Attach VHD - browse to it - it will mount and you can copy files off it, just like any other drive.
The problem you have may be a ntfs permissions issue.
If you copy the folders off the mounted vhd onto another partition. - you may then be able to open them from their new location.