User blog:Crazy sam10/Mass Effect 2 Files found on Black Ops II disks

PC gamers who brought the PC retail version of Black Ops II have run into a surprising error. Upon trying to install the disc Mass Effect 2 files will be on disc 2 instead of Black Ops IIs (seen here). This issue has already been raised on many forums and it is assumed Activision is looking into it. It is unknown how this incident occurred, luckily PC users can get around the rather strange error by activating Black Ops 2 via Steam and downloading the game that way.

Source: The sixth axis. Thanks to Verantha for forwarding this information.