Ok First 2 suggestions would be use manufacturs specs get the seriel do some reaseach on what that maker put into that particular build
Then after you have found this informantion out proceed to check if they have updated
drivers available through them
Since windows can't detect or figure it out they should have a moded
driver for the win 7 that would be most likely the only steps you can take besides
getting links to possible nvidia software
drivers that run on win 7
Yet one more issue may occur if it isn't any win 7 update you're going to have to make do with a vista
driver that would be somewhere in the ball park note you won't be doing any more updates for that
driver for a while
also suggest if you do gain the driver and detect this system flash it right away and make sure you mark it for future install issues
Almost for got this as well if you upgraded from vista to this platform that might be you're issue there too always do a clean install never upgrade ok i said enough so i hope what i have said works for you