Shut down GameGuru, and shut down steam completely, restart steam and then GG and see if that helps. Steam server has been up and down all day, maybe causing an issue with this morning .025 update.
See if this fixes the problem.
Thanks
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