Gaming problem - game won't run at higher resolutions

Hi there,
I recently purchased Parallels to run windows 10 on my mac primarily to play an old game I used to like (Final Fantasy 11).
I've installed Windows 10 fine, and FF11 works fine, however the highest graphics setting the game will run in is 1024 x 768 (which looks hideous). Anytime I select any other resolution the game just crashes and won't launch.

The Mac monitor resolution is 2560 x 1600, and Parallels has no problem displaying in that resolution. I assume this is some problem with Parallels using a virtual graphics card/driver? Is there any way to fix this?

I have the latest Direct X installed.