Please post the exact URL to your board.
Is there any more to the error message? Do you have access to the server error logs. Sometimes you can get more detail there.
Be sure the Modules directory and all of it sub-directories and contents have been uploaded in ascii mode. If your ftp program was set to automatic, the .pm files may have been transferred in binary, a bad thing. If you unzip on the Unix box, you must use the -a switch:
unzip -a filename.zip
Check that all of the vars_ and vars_wordlet_ files are set to 777 permissions.
Be sure the Templates sub-directory has been fully uploaded.