Explorer doesnt start on login?

Explorer does not start on login! I know how to make it start. but the problem is why does it not automatically start?!? Other then that so far i love win 7!

Oh please someone help help! Everytime u login Explore starts and my Documents opens. but explore for some reason doesnt work correctly. so if u stop it and restart it the computer works fine. but if u login another user then u have to do it again. why is this happening?

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