Somebody help me, fallout 3 wont work.

after installer it I got this ''xlive.dll was not found message'' so i downloaded ''xlive.dll'' and now I am getting this error message saying ''xlive.dll is not a valid windows image''. Does anyone know how i can fix this? or maybe were i can download the ''xlive.dll'' from fallout 3? i think the one i downloaded was for halo 2 or somethingSomebody help me, fallout 3 wont work.
According to Bethesda's PC FAQ you need to download this.

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