For anyone who - like me - is forced to use Windows 8/8.1, but hates lots of the non-negotiable features, I commend to you Winaero. From them, you can download two lightweight programs which:
1. Allow you to turn off the bottom-right hot corner, meaning the stupid Charms menu doesn't pop up all the time (
Charms Bar Killer runs in your systray, and allows you to turn various hot corners on and off).
2. Allow you to fine-tune, and indeed turn off, the taskbar thumbnail previews meaning the the silly little windows don't pop over the thing you're trying to look at (
Taskbar Thumbnail Tuner is a run-when-you-need-it selection of extra settings, including the mighty "disable thumbnails" tickybox).
(There are various registry hacks proposed on t'internet to solve both of these. I haven't tried them.)
If the above are features you like and use, then hurrah! However, in my case they were nothing but a source of irritation.
I think nearly 12 months of locating settings, finding obscure menus, and downloading extra bits means that I'm now willing to declare a sort of armed truce with Windows 8 (or, actually, 8.1 now). It has agreed to keep all its spurious Mac-esque eye-candy and ridiculous Metro nonsense out of my way, and I've conceded that a very small amount of the new functionality is useful.