Have you tried updating your video drivers? Several people have had slash1.dll errors without the latest drivers.
Some people have gotten an 'unable to read configuration file' error due to having .div files associated with a divx video player.
Try deleting the files config.div, slashed.cfg and slashed-d3d6.cfg in the Beyond Divinity folder (if they exist), to force the configuration program to recreate them.
If you run dxdiag (click Start | Run, type in dxdiag and hit Enter), does it report any problems?
FSAA = Full Screen AntiAliasing
Mode 0 is disabled, higher modes are different ways to smooth out jagged edges in 3D models, to try to improve visual quality. It is more useful in full 3D games, such as first person shooters with a lot of straight lines along corridors, etc.
