VMWare is an EMC Corporation filial, specialized in virtualizartion software for x86 computers. Between all the the specialized and comercial software, VMWare have one free version named Workstation Player, product really easy to install and use, with great performance and stability, then if you want to learn or run a second operating system into your personal computer, you can use this software without restrictions. VM Ware is available for Windows and Linux.
Remember that "Commercial organizations require commercial licenses to use Workstation Player".
Navigate to the WMWare Download page for free products here
Click on Try Workstation Player for your operative system: Windows or Linux. After this, the installer will start the download process.