Instead, in such a case, you can dual-boot Windows with OS X using Apple’s Boot Camp software. If you have enough free space available on your Mac, but running low on other resources, such as memory (RAM) or processing power, virtualization might not be an optimal solution. Parallels Desktop is a great virtualization software for running Windows programs on OS X. If your Mac has enough free resources, you may consider running a Windows OS on Mac via virtualization.