So, I thought I liked Windows 8 a bit. The OS itself isn't absolutely horrible once you get used to it. I even bought the $40 upgrade to Windows 8 for my main PC, where I promptly spent 100% of my time on the desktop and not in the Metro apps.
But, I just bought my first computer that actually had Windows 8 preinstalled on it: a Samsung Series 5 Ultrabook. It has a touchscreen and some nice features, and I wanted to dual-boot Windows 8 and Fedora Linux on it (giving Windows the smaller half of the hard drive, of course). Microsoft apparently went to great lengths to make this darn near impossible.
I came to find out, when you have Windows 8 pre-installed on your computer, it's probably the Windows 8 "Core" Edition. The only Win8 install DVD I had laying around was the Professional edition that I bought for $40. It was logical to me that I should be able to hopefully reinstall Windows 8 on the ultrabook from this DVD, maybe even using the same OEM product key that the laptop came with and not having to worry about any activation issues.
Apparently, Windows 8 PCs have their product keys "baked in" to the BIOS ROM. If you boot a Windows 8 installer of any edition, the installer looks for this product key in the ROM, and if the key is for a different edition than what the installer is intended for, it gives you some ugly error message about, "The product key you entered doesn't correspond to any of the install images. Enter a different product key." -- except it doesn't let you enter a product key anywhere, and just restarts the setup process from the beginning.
There also apparently is no Windows 8 Core ISO floating around the Internet -- not one that I would trust downloading, anyway. With the baked-in product key, the only Win8 installer that would work would be a Core edition installer, which doesn't exist. You can't install Windows 8 Pro on your computer, because the installer simply won't allow it.
Long story short, Microsoft has basically forced me to forego dual-booting completely and just install Linux on the entire hard disk. The built-in Windows 8 OS came bundled with a bunch of Samsung's crapware, and there's no way to "start fresh" with Windows 8 -- your only option of "reinstalling" is to use the Control Panel feature, which restores "to factory settings", which means your Samsung crapware is still gonna be there after the reinstall is done. And you can't install from scratch from a DVD for the aforementioned reasons.
You can even completely remove Windows 8 from your computer, maybe install Windows 7 or Linux across the whole drive, and you still won't be allowed to put Windows 8 back on there from an install DVD or USB again.
There is a workaround, though: if you make a bootable USB for Windows 8, you can add a text file to it where you specify the product key to use. For me to do this, however, I'd need to buy an additional Windows 8 Pro license, and that's not worth it to me. So, good riddance Windows 8, I don't care to have you on my ultrabook anymore, anyway.