We have been experiencing alot of blue screens working with Windows7 and SW2011 64 bit. Both the operating system and 2011 64 bit are new to us. We have changed video drivers but to be honest it seems to me to be a permissions problem more than graphics problems. Happens the most when people are accessing the network. By the way we are using Dell T3500's with 6GB memory and Intel Xenon quad core W3565 3.2 GHz processor with a nVidia Quadro 4000 video card.