on the link
i gave you, i see as below. i don't know why it's blank for you.
you need to select your flavour of windows 7 from the 'select an operating system' box...
i don't know which one you will need as you haven't told us which version of win 7 you use.
you need graphics drivers for the 865 family
then you'll see available drivers lower down the page.
good luck and let us know if you need more help.