hi all. Sorry if i sound like a total noob and sorry if this has been addressed already. its a little long winded so... I have 2 systems a win 7 home prem, 64 bit, 2 gig radeon card, 4 gig ram, a stock install of gp4.(no gpx patch or anything else) just the game and official patch. it plays fine apart from trying to calibrate the sound at each play (cruddy on board sound) and random crashes saby Subsanity - Grand Prix 4