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If you like to try Windows 8 but don't want to give up Windows 7. Here's how to dual boot Windows 8 with your current Windows 7 installation so you can run them both side by side. All you need to do is create a new partition for Windows 8, install it on that partition, and then edit your new boot menu so Windows 7 stays the default OS.
As you can see in my disk management, I have a 160GB hard disk that is configured with a 64GB partition on which Windows 7 is installed and other two data partitions. What I need to do now is to make a new partition for Windows 8 installation.
Download EaseUS Partition Master Free Edition to resize existing partition and then create new partition.
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1. Insert your Windows 8 disk installation CD and reboot your computer (you'll need to have enabled booting from your DVD drive in your system BIOS).
2. Windows starts to install automatically. When you're choosing installation type, be sure to select Custom (advanced).
3. Be careful here. Choosing the wrong partition could mean wiping your other Windows installation altogether, so make sure you pick the new partition created for Windows 8 installation in the first step. Choose it to continue.
4. When you're done, your computer should reboot into Windows 8. It'll probably reboot one more time after it does, then you'll be greeted with the Windows 8 Start screen. If you choose to enter a Windows Live ID here, make sure you have access to your email and can confirm your computer - otherwise it might not let you boot into it.
When you first boot up into Windows 8 that you're presented with a new graphical boot menu that'll let you choose between your Windows 7 and Windows 8 installations. Windows 8 will be the default, meaning if you don't manually choose Windows 7 from the menu, your computer will boot into Windows 8 after three seconds of inactivity.
(If you don't want to make Windows 8 the default quite yet, so here's how to make Windows 7 the default. On the boot menu, click on the button at the bottom that says "Change Defaults or Choose Other Options", and hit "Choose the Default Operating System". From there, you can pick Windows 7 from the menu. From now on, your computer will boot into Windows 7 by default.)