Hmm, it seems to be the game, did you try the torrent download? When meshes and textures are missing, it sometimes will indicate that a file is missing from the download. Try downloading the torrent, and if this dosn't work, then check Pt. 2 Of this post.
Pt. 2: So your trees, plants, and character screen textures are missing right? Well, if you think it's your graphics card, check the age of the computer it's self, and if it is a older computer, then do look into updating drivers, video card drivers, and your other drivers. Once these are all up to date and such, check to see if the game works. If it does not work, then refer to trying the torrent download as stated in Pt. 1.
Pt. 3: Changing the Ogre file and rendering system wont help missing files, also check your particles folder located under your Local Disk drive or where ever you saved you FH folder, and go under Media, then click Particles. Check for any files with the ending of _0 or _1 or _2. If you find any like this, delete them, then check your game again.
Hope this helps floof~
- Dr. Druid