@Daniel:

Awesome! Glad to hear it's seemingly resolved itself. One other item that's worth mentioning (if not for you, than for others in the future) is that Microsoft's @MicrosoftHelps twitter account is very responsive and has helped us resolve these issues in the past, so always feel free to tweet them for support.

Thanks for letting us know that it's fixed.

Hi Daniel,

Have you already tried reinstalling your game? It looks like several of the "XLive" (GFWL) addresses are missing, along with one of the Arkham City addresses.

First I would verify integrity of game cache (using Steam, as described by Mik below), then see if that Arkham City binary is found thereafter. If it is, you'll also need to fully uninstall/reinstall GFWL.

If t his doesn't work and you haven't yet fully deleted and redownloaded the game, then that would be the next step.

You ask good questions, but all of those items are addressed in individual product reviews across the net. Plainly-put, we don't have the resources or means to test every configuration, but we're trying to get there.

I'd recommend looking up the individual product reviews on Anandtech, Hothardware, and TweakTown. They'll give a full rundown on the items you're asking about.

We're getting there, but it'll be a while yet.