Thanks again jjrcng, but it really doesn't work. Perhaps I have an older 27 inch imac to yourself, or a different graphics card. The computer is a 27" iMAC with 2.66 quad core i5 processor and ATI HD 4850 graphic card late 2009 model version. Even doing all the things you have stated, and using admin priviliges on the PC side for each of the setup.exe options, which is using windows 7 ultimate on the bootcamped partition, it constantly fails to instal any driver later than a 2011 one, labelled as 11.1. It will install audio drivers and a whole bunch of paraphenelia, but the section on display driver always comes up as "failed" after trying to install it using catalyst (or manually for that matter). I even purposely re-installed an older driver and made it look again for the latest version, but it still would not go beyond the 11.1 version when scanning for the most modern driver over the internet and the hard drive. I think ii'll have to treat this one as a day of my life lost in fruitlessly attempting to update drivers that this computer refuses to accept.