It may also be a failure in the video card if there is one - graphics mode vs text mode. Might be worth booting from a Linux CD/USB to check for display issues that way.
That said, I'm pretty sure the only "Vista-level" systems still under even extended support are Windows Server 2008 (non-R2) boxes, where the only supported browsers available are IE9 and Firefox (I think). If that really is actually a Vista desktop, it should be replaced even if it's with a refurb.
Edit: Also, I assume that's a found image not one from the actual system, correct? Because that "Wine configuration" surrounding the scaled dialog box looks just fine.