a few days ago I have noticed some flickering on the floor around the lamp. I have no idea what it could be. I have tried latest Nvidia drivers + beta and it is still there. I have made a video of it. I got a GTX 570, 2500k, 8GB ram, W7 64 Bit.
http://www.youtube.com/watch?v=kcDaRbNV3v0