In a statement just sent to VG247, Bethesda's confirmed a Games For Windows Live DRM issue is causing problems with the PC version of Fallout 3 DLC, Broken Steel
“We’re seeing the same error, which is a Games for Windows Live DRM Install error," said a spokesperson for the firm.
"Microsoft is working on fixing it, and we’ll let everyone know once we’ve verified it.”
The statement went on to say that the Xbox 360 version is also experiencing difficulties, and server-synching and new Achievements to blame.
“The Xbox Live servers don’t seem to be fully synched yet with the additional Achievements," said the rep.
"This should fix itself automatically soon. People won’t lose any achievements.”