I have recently aquired an Alienware x17 laptop, quad core (2.0 gig), running win 7 ultimate 64 bit. I have been trying to run doom 3 on it and have had it crash a few times, as well as the fact that i can run it only at 640x480 res. it still jerks A LOT when i am faced with an enemy. my understanding was that this machine is a gamer's machine... what is going on here? incidentally playback of movie files is pretty rubbish too, quite jerky. i also get lag when typing in form boxes such as those in FB. clearly there is something wrong here but i do not know how to fix this. any ideas?