"Gigagamer2 i warn you with doom, it is playable with a 6 series fine but with a 5 series all the shadows are just black, no texture and its hard to move around without hitting a monster. " Nonsense! I played it for the first time on a fiasco era Geforce 5900 and it wasn't so!

The reason some of them don't work might be hardware related not just because of Vista.