Picking out the key term as "should I?"
Are you having any graphical problems with AH or any other games?
If the answer is "no", my opinion is no as long as your current directx version is supported by the drivers your using.
You 'can' update if you want to, but the software you are running pretty much dictates when you 'must' update.
Personally I skip several versions of NVidia drivers at a time because some versions work well with everything I run, while others may cause an odd problem with a particular app. When I find a version that runs the most apps stablely, I like to keep it until I 'have' to update it to run something new. More than once Ive had to revert to older drivers because the newest version caused a problem with AH or another game.
