Vista should find every driver. If you're worried or don't have the motherboard driver cd, I would download the vista drivers off ecs' website and burn them to a cd before installing vista.
The drivers should be marked for vista. The lan driver is the most important; once the lan port is working, you can download the rest of the drivers off microsoft's website. But I don't think vista will have any problems finding the drivers. I've only had problems with me asock p45 and g43 boards; both were produced after vista came out.
If you're this worried, why not buy another hardrive for vista only. Save your old hardrive for a spare. I don't know if you have to save any files; as long as your memory is running well, you should have no problems installing vista.
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