Got a netbook or a laptop without an optical drive but want to install Windows 8? No problem! This where Microsoft’s USB/DVD download tool helps!
Just download the tool, format your 8GB+ USB stick to fat32, point out the location to your Windows 8 iso and done!
Now, restart your computer and open up your BIOS settings and choose source as USB stick instead of hard drive. It would now boot up just like a normal CD/DVD does.