As we saw few days back Windows 8 Release Preview is available for free. If you haven’t downloaded it yet, you can download it right now. After downloading the iso file and mouting it using any image mounting software, if you use the default setup it will upgrade your Windows 7 to Windows 8. As it is not a stable release you might not want to upgrade your current OS right away. So the only option left is dual-booting Windows 7 with Windows 8.
Before doing this make sure you have an extra partition except the one where your current OS is installed. If you don’t have an extra partition with enough free space, go to start and type Disk Management. Run this tool and use it to create a partition out of the free space. Windows XP users can use Free Partition Wizard to create new partitions.
Typical Windows 8 installation requires 15-20 GB of free hard drive space. So make sure you have enough space before proceeding further. You can use the comment box below if you are facing any issues.