I have a new Lenovo laptop with Windows 8.1, and the alt-tab dialog looks like Windows XP.
Like this:
instead of like this:
It also contains a bunch of default icons that don't display a name. How can I fix this?
Well, I restarted my computer to install some updates and it went back to normal. I don't know if the restart or the updates are what fixed it. I guess I'll accept this answer unless somebody comes around with a better explanation.