Just installed Win 8 on an old desktop home theatre system. It works well and for those that keep freaking out about it, on the Start screen with all those funky live tiles.........there is one called desktop. Desktop = Windows 7. Also, use the windows logo key on your keyboard to switch back and forth between live tiles mode and old desktop mode.
S-can your mouse and get one of these - Logitech T650 touchpad. Once you use this oversized touchpad, your computer will look and feel like a tablet. Windows 8 is made for tablets and laptops with touch screens. If you don't have a touchscreen, add the T650 touchpad. T650 Wireless Touchpad for Windows - Logitech
Windows 8 takes a few days to get used to. Remember how many days it took you to get used to Win XP when it came out? Droid tablets have a learning curve and so do smart phones.
Windows 8 automatically searches the web for the correct driver to fire up accessories Hooking up my old monitors, wireless keyboard/mouse, printer, etc. worked just fine.
Win 8 has a bug in it...........Save money and buy the cheaper upgrade disk version. If you don't have any previous windows operating system installed, don't worry about it. Install Win 8 as a fresh new install. Works fine but you can't activate it with the upgrade key. Sooooooo, when running 8 in desktop mode, reinsert the Win 8 dvd and reinstall Win 8 in the upgrade mode. It will take the first version you installed and rename that to windows.old then it installs windows for the 2nd time - as an upgrade. The activation key for the Win 8 upgrade version then magically works. The full boat version of windows is WAY more expensive than the upgrade version.
Don't ask me how I know this stuff. I'd tell ya then have to kill ya. JK LOL