After having installed 7, I noticed the following issue: the mouse pointer would move smoothly across the screen most of the time - unless I move it quickly from any direction towards the top-left side of the screen. When the pointer reaches 1-3cm from the top-left, it would freeze/halt for approx 1 sec and then move properly again. This is not a performance issue due to a high resource consuming app; everything is closed when I tried this, but also occurs regardless of any apps that I am running. I have even replaced my old intelliwheel MS mouse (which I ve had the last 14+ years) with an M-SBF96 (Logitech). Both the old and the new mice are PS2 (not with an adaptor, just 'pure' PS2). I don't like the idea of having a USB mouse, but I don't think this is the problem here because the mouse is listed as 7-compatible hardware in the MS website. So, my guess this is either a graphics issue (I have an ATI HD3650 with lastest drv installed) - or most likely, a windows bug. Anyone came across that? Any suggestions?