Without knowing fully the spec for Empire At War, most of you can perform a simple check online, thanks to Microsoft.
However, this will really test your PC, however The Game Advisor database does not currently contain specific graphics card feature requirements for this game (such as T&L support, pixel shader version, etc.). Please verify that your graphics card meets the requirements set by the publisher but once you find out the make of your card, just google it to see if it has T&L for example.
Also, the Game advisor will try to install a piece of software, so you might need to check your pop-up blocker to allow this to happen during the process.
I would run a check against either Warhammer Dawn OF War or Rome Total War as I have a feeling that EaW will be along these lines in terms of spec
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