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some times you can't install virtual Box because your processor may not contain visualization technology , or because of Low RAM ( e.g.1 G ) so what to do then ?
just partitioning the disk and create a dual boot system. When you'll strart your pc you'll choose which OS must be booted.
Just follow this instruction http://www.dedoimedo.com/computers/dual-boot-windows-7-ubuntu.html
you can change operating systems any time. install ubuntu, when you want windows, and want to remove ubuntu, do a format and install a fresh windows.
OR
you can install windows, and leave a blank space for Ubuntu, and then install Ubuntu on the blank space, this way you will be able to dual boot . i.e. start windows, restart and select Ubuntu to boot from. again restart and select windows to boot into. (as you wish.) and this way no struggle of formatting and installing OS again.
A Dule boot can provide the way to install2 diffrent operating system in a single hardware
Dule boot provide the functionaly to install two diffrent operating system in a single hardware. but only one Operating system loads at the same time.