|Running Windows 7 and Windows 8 at the same time|
For this tutorial we will install Ubuntu inside windows 7 by using Oracle VM Virtual Box.
STEP 1 : Install Virtual Box which can be downloaded from here: https://www.virtualbox.org/wiki/Downloads. Select the installer base on your current operating system.
STEP 2 :You need to download the ISO file for the operating system of your choice. In this tutorial Ubuntu ISO file can be found here: http://www.ubuntu.com/download/desktop
STEP 3: Now we will start to install Ubuntu using Virtual Box. Open Virtual box and click new, now select name, type and version base on your operating system, here are some references:
Name: Choose any name you like
Windows : XP,Vista,7,8,8.1
Mac OS X : Lion, Snow Leopard , Mountain Lion, Mavericks
32-bit and 64-bit Selection : Base on the ISO file you've downloaded.
STEP 4 : Choose the amount of RAM you want to use for this operating system, minimum is 512MB for Ubuntu, but it is strongly recommend to use 1Gb and above. 64-bit Operating system must use 4GB and above for the best result.
STEP 5: Select "Create a Virtual hard drive Now". Select VDI (Virtual Disk Image) . Select "Dynamically Allocated then select the maximum amount of disk space (for ubuntu I set to 20GB).
STEP 6 : Now click create and you will see it on the left panel. Right click and select start.
STEP7: Click on the folder icon and then select your ubuntu ISO file and click start.
From here you should be able to install ubuntu normally like you always did to install it natively on PC. If you are new to Ubuntu, just follow on screen installation instruction. You can use this method to install any OS of your choice.