Please see the most recent updates in the "Where did the .com name go?" thread. Posts number 16 and 17.
I respectfully disagree.The latest driver.
You should always keep your graphics card up to date.
The problem is when you have many flight sims or other newer software AND the older stuff (FSX) and need it all to play nice with the GPU driver...I also agree with JAFO. I find a driver that works well, then stick with that one. If there is a problem, I'd try new drivers, but new drivers tend to add support for new cards and new games, rarely do they seem to have a real benefit for older cards or old games and sims, but may introduce problems with old games or sims.