

This can be a temperamental process as there is a lot of variables, but if you search for how to restore a WIM file to a hard drive, and study the post-restore process to create the system partition, you will probably have success.

I think there is a way to access this through the wizard following the 'repair' steps, but you should be able to just press shift+F10 on the 'select disk' page of the windows new installation wizard to open the command prompt. If using the installation media method, you want to open the command prompt. Boot into Windows PE from either PE media you have prepared earlier, or from a windows installer disc.This can be done in much the same procedure you would use after restoring a WIM.

If Windows isn't attempting to boot at all, I would first try repairing the system partition manually.
