The d3d8.ini and d3d8.dll files go in the same place as cfs3.exe. (You may want to edit the ini file to suit your preferences, as described in the readme file.)
The shaders30 folder goes in as is.
The optional water textures go in the Effects\Fxtextures folder. (Back Up Your Originals!)
If your hard drive crashed you could go to a PC place that specializes in data recovery. I went to Tech 2 U here in Northern CA and they recovered everything from an old laptop drive. It cost me $250. It just depends on how bad you want the data back.