For all your PC requirements

Autodesk AutoCAD Inventor Suite 2011
Whethere you are professional ingeneer, designer or just have great ideas - Autodesk AutoCAD Inventor Suite 2011 is a comprehensive and flexible set of software for 3D mechanical design, simulation, tooling creation. Build, modify, improove products in less time.
Autodesk Inventor software is the foundation of the Autodesk solution for Digital Prototyping. The Inventor model is an accurate 3D digital prototype that enables you to validate the form, fit, and function of a design, minimizing the need to test the design with physical prototypes. Use a digital prototype to design, visualize, and simulate your products digitally, reduce errors, and deliver more innovative product designs faster.
AutoCAD Inventor Suite 2011 includes:
Features
Design Communication and Data Management
CAD Productivity Tools
System requirements:
For General Part and Assembly Design (Typically Fewer than 1,000 Parts)