The first weapon of choice we previously shared may not be as helpful to some users because it literally replaces the current OS with Windows 8 but, today we are going to show you how to bypass this impediment. There are ways of installing Windows 8 and run it on the same computer, alongside Windows 7. The method is called dual-boot and I am positive you've heard of it before. Basically, when the computer starts, you will be prompted with a bluish menu from which you can select the desired OS. Whenever you want to switch, simply reboot the PC and that's it.
Besides a normal computer we will also need an empty partition, with at least 20 GB free space. This is the amount of space recommended by Microsoft for the x64 architecture; 32-bit owners should have about 16GB. The space will be totally occupied by the OS's main files so you should have at least 5 more to spare for any programs that will be installed. The partition may be one previously made or, as we are going to show you in the steps below, divided from another existing disk.
Also, you can dual-boot Windows 8 right along any other operating system; we simply used 7 as an example. Some commands may differ but the core remains the same. The guide will be divided into two main parts, with the first one taking care of creating a big enough partition. If you have one already, you may skip it.
Part 1: Creating Windows 8 Partition
1.Press "Start" + "R" buttons to open the Run menu.
2.In the Run box, type "diskmgmt.msc" and hit Enter.
3.A window like below will appear. Select the partition you want to divide right-click on it and then choose Shrink Volume.
4. Type the amount of space you want to divide in the appeared box and then click on Shrink. Take note that 1GB=1024 megabytes.
5.When it finishes, the new drive will have a black header. Right click on it and then on "New Simple Volume" to make the configuration wizard appear.
6.Choose how much of the free space you want this drive to have (default is good), assign it a letter and when prompted for a volume label, Windows 8 should be a nice pick. Also, make sure that the "Perform a Quick Format" box is ticked before you click next.
Part 2: Installing Windows 8
1.Download the compatible Windows 8 file and save it on the hard drive.
2.Using a disk-mounting program like DAEMON Tools, mount the .iso image on a virtual drive (steps 2-4 from here).
3. Open the drive and navigate to "Sources", where the file "setup.exe" must be launched. Do not follow the instructions from the Autorun because you will upgrade the system.
4.A normal setup will begin, in which you must first choose the installation language and then opting for the Custom (Advanced) menu.
5.Then, choose the partition where you want to install Windows 8 to, the one we previously created, and click next. The installation will begin.
6.When it finishes, complete the remaining details using your own options and restart the PC.
7.You will be welcomed by a screen like below. If you don't express your choice in 3 seconds, Windows 8 will start. To change the default OS, press the bottom link and follow the steps.