well, tried the installation again and it worked fine. think on my first try I installed the missing dlls ok, but needed to restart my machine with the 'allow unsigned drivers' option (or something)... maybe. anyway, up and running now (so is Grim Fandango thanks to http://www.start64.com/ if interested!).
performance is still very sluggish though which i'm not happy about - really drags on my PC compared to imac... not an x64 issue though as happened on x32 XP and have tried with a couple different graphics cards... maybe will start another thread!
thanks, James.