In this use, structural steel rebar provides the strength and stiffness to the concrete, while the cured cement holds the rebar stationary. Rebar alone would flex too much and cement alone would crack easily. However, when combined to form a composite, an extremely rigid material is created.
Autodesk ended Vista support in 2012 and the versions 2013 and up are not compatible with Vista. AutoCADu 2008 (and 2009-2012) compatibility applies for both 32-bit and 64-bit versions of Windows Vista Home Basic, Home Premium, Ultimate, Business and Enterprise. For AutoCAD 2007 and AutoCAD LT 2007 Autodesk has released Service Pack 2 which makes them compatible with the 32-bit version of Windows Vista.
Before you install AutoCAD 2011, make sure that your computer meets the minimum hardware and software requirements listed below. The installer automatically detects whether your operating system is a 32-bit or 64-bit version. The appropriate version of AutoCAD 2011 will be installed. You cannot install the 32-bit version of AutoCAD 2011 on a 64-bit operating system.