to explain - there seems to be some issues with FU and laptops (mainly running on NVIDIA Optimus, which sets the Fusion to use intel GPU, instead-of NVIDIA by default). since in 7.5 You cannot select OPENCL device, You do stick with intel. on laptops. But in Your config, the working hardware is a laptop, so no solution there..
perhaps there are some "Aero issues" or "parental / account control" switched on - just a wild guess, but this are the main changes in win7 over xp

cheers