I have just recently had v10 installed on my desktop and have had no problems until just now when I notice that the Raster Calculator does not work. The tool opens and I can select data and operators but on clicking OK, nothing happens and no output is made. Then I notice that a great many tools similarly do nothing. Reclassify works and so do the Surface analysis tools, e.g.Slope but without trying every one I am not sure which do and which do not function. I also have v10 installed on my laptop and all of these work perfectly. Its really irritating. What could be the cause?