I had a drive with a full Win 7 install on it, but I installed a new Win 7 to a different drive, and the Boot configuration on that drive was completely removed. What would be the easiest way to reinstate that boot config?
If there is a Windows 7 installation on your computer which does not have a corresponding boot menu entry you have to add it.
(Visible installation is a installation on a mapped drive - e.g. has a drive_letter associated with it.)