hi whenever i install AutoCAD architeture 2012, the pop-up show that NET 4.0 is install in my laptop. i also try to go to microsoft website to download NET 4.0 framework and whatever related to NET 4.0 and it still cant work. May i know what is NET 4.0 is? and how do i install the software for the AutoCAD architecture 2012 to my laptop?