I use engineering software daily on 7. I use mozilla with third party vons and anti virus.
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Maya? 3DSMax? AutoCAD? Modo? Houdini? ShaderForge? Unity? Unreal? Substance? ProTools? Wwise? Audition? Photoshop? Premier Pro?
NX with FEA analysis, CAM, reverse engineering, and surfacing, networked in with a XP machine driving a CMM. And Solitaire.