¿Did you install the "CS-Win32Libs"?
, these libraries are required by Crystal Space.
If you haven't download these libraries you can download them here:ftp://sunsite.dk/projects/crystal/support/win32/
If you want a little information about these libraries, please visit this section of the CS wiki:http://www.crystalspace3d.org/tikiwiki/tiki-index.php?page=CS+External+Packages
A more complete information can be found in section 2.3
of the Crystal Space user manual.