What error code.
An offline multiplayer app does not exist for Game Guru yet. It is planned for the future.
Right now users need to own Game Guru and have a steam account to play multi player games.
Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz, 2400 Mhz, 4 Core(s), 4 Logical Processor(s), 8gb RAM, Nvidia gtx660, Windows 7 Pro 64bit, Screen resolution 1680 x 1050.