Hi newcomer and welcome to the Tom's hardware forum.
1- You always can go to the manufacturer's web site to look for the drivers. See manufacturer's web page
2- If u can't find Win 7 drivers but exist Vista drivers u can use it since Vista and 7 are very similar.
3- If u only can find driver for XP or older OS versions like 2000, u can install Everest to know the manufacturer of the components and try to look for the drivers in the components manufacturer web site.