With the free VirtualBox software is it possible to setup demo environments very simple and fast. This video show the installation process of VirtualBox and then installation of Windows 7 x64 SP1 as a Virtual Machine.
The installation is run on the following hardware
AsRock Z68 Pro3-M motherboard, Core I7-2600K CPU, 16 GB of RAM, Dual 60 GB SSD and 2 TB traditional HDD. The processor is overclocked to 4.2 GHz using a better CPU cooler. Total cost of this system is less than $1000.