Originally the game worked fine for me except for the fact that none of the cutscenes worked... which I thought was pretty important. After adjusting a number of settings recommended by a shit ton of different posts out there, including disabling nvidia 3d, using integrated graphics only, messing with the display options, changing the power options, editing preferences.ini, running the game in Win XP compatibility mode, etc. etc. etc., I've completely fucked the installation to the point where it won't even boot up now. Keeps giving me some Steam cannot be found error even after uninstalling and reinstalling both the game and Steam.
it works fine on my desktop just like it does for you. But there is some weird combination of specs that produce this comedy of errors and if you check the Steam forums, a lot of people have the problem too.