I finally got FPSC v1.05 to work with Vista. (not FPSC's fault but those Vista security settings)
I have a widescreen monitor and don't have any problems. (haven't had any resolution problems at all)
You might want to try updating the drivers for your video card.
Is FPSC the only program with resolution problems?
Do you have DX9 installed?
I can see that your new computer has Vista which has DX10 by default. (Maybe that is the problem.)
You can run both DX9 and DX10 on the same computer. (that's what I had to do to get the X10 demo to work)
You should have got an error though if you didn't have the right version of DX9 installed, but it may have skipped it since the DX version was higher.
Go download the latest DX9 and the latest drivers for your video card and you should be okay.
Also give yourself (your log on name) full permissions for FPSC if you use it on Vista.
I found Vista was flakey in recognizing Admin privileges and only worked right when I manually set the permissions for my user name.
(it didn't care that I already had admin privledges)