Check that the font file actually exists; in Windows Explorer browse to the '
..\Divine Divinity\Run\fonts' folder, or just search for '
fontn1.fnt' (should be 29,098 bytes).
Are you shutting down all non-essential programs (especially anti-virus) before trying to start the game, and did you do so before installing?
I would try a clean re-install of the game, or use the file verification method described in the topic;
Troubleshooting Tips (& manual install procedure) 
