I'm not a huge fan of ADE on Windows. Ask them to try using Readium for Chrome.
That said, Windows hardware is all over the place in quality, so getting those specs, including the video card, is a good first step.
I know ADE is not you're favorite reader, but to most viewers it's the easiest way to get and install their required reader.
Readium poses even a secondary requirement (the Chrome browser) and is a bit awkward to use. No matter how good it is, it is two steps back in ease of use. The only fall-back I'd suggest is Adobe's online viewer (through any modern browser).
Now that we have the whole ADE line-up available (OSX, iOS, Windows and Android) plus the online viewer, I think the best direction is to promote ADE and hope Adobe will be churning out updates real soon (with update warnings within ADE) to get this ePub 3 FXL ball rolling !
Regardless. Readium is a superior reader and until such time that all readers catch up to the FXL format, it’s necessary to check the EPUB there.