As was already said, your card only has access to shader 2.0 and since D2 requires 3.0, i wouldnt buy the game since its very likely it wont run.
You can go to this page at your own risk and try the "workaround" for shader 2.0
http://wiki.answers.com/Q/Can_I_emulate_pixel_shader_3.0_when_my_card_only_supports_2.0But, even if you can make the game run, it'll run very, very slow.
Good luck