Please re-install the full version of MetaTexis available at www.metatexis.com.
If this does not help, download the file "fm20.zip" at the following location:
http://www.metatexis.org/download/fm20.zip
Unzip this file and save the files included in the directory "c:/Windows/system32" or "c:/WINNT/system32". If you are asked whether you want to replace the existing files, do so.