I run flight simulator fsx in SLI mode on vista ultimate with two nvidia 9600gt graphic cards. problem is that only two of the nvidia display drivers namly 171.16 and 174.16 work. Any other latest driver dose not work with the system. After some time fsx and computer hangs and i would have to put off the power and restart the computer. while this problem dose not happens with other two above mentioned drivers . what could be the reason. How can use the latest display drivers.