I just finished doing a clean install of Windows 10 after having upgraded from 7 and have the latest AMD Crimson drivers. My main display resolution is 720p. I installed a couple of my games, Spelunky and Alan Wake's American Nightmare. When I run them the image gets squished with black bands on the top and bottom. I worked around this with Spelunky by setting the resolution at 1080p, but I don't want to try this with American Nightmare as I have a weak card (Radeon HD 7770). I should note that none of the Steam games I've installed have this issue.

EDIT: Just happened with a Steam game. From looking at another thread, it might be a driver issue. I'll see if reinstalling the video driver helps.

EDIT 2: Driver reinstall worked. Please ignore my derpage. :P

EDIT 3: The issue has returned. This is really baffling.

EDIT 4: It looks like I found the answer, or at least a workaround. In the AMD Radeon Settings, I clicked on the Gaming tab, then selected the game that is having issues. Then I clicked on Profile Options and under Display Scaling I selected Full Panel. Apparently the default settings isn't cascading down to the individual game profiles. I also clicked on All Profiles->Enable but I'm not sure what effect that has. A pain in the ass but, there it is.

Doesn't the driver installation usually tell you if it fails? :P

Not that I've ever seen. Anyway, I found what was probably the culprit in this thread. Just have to set Windows to not automatically download drivers.

Are the nVidia drivers the ones that usually show the installation error, at least if you not select custom install, then "make correct installation" (aka, clean installation, removing all the profiles). I don't know if this is fault us nVidia or MS, but is near a year of the official launch of W10 and no one of the both fixed it yet.

I've had the same issue on W7 lately. Need to wipe drivers before I can install the new one.

Sounds like a scaling issue to me? Check your Catalyst Control Center settings (and if you have an integrated+discrete setup, check the Intel HD settings) for scaling settings.

Or at least, that's what I think is the culprit. Could be the difference between a 4:3 game stretched or with the aspect ratio kept.