I've been having issues with resolution as well. And I tried the admin and regular for the setup. Then RO wouldn't even open. I uninstalled, deleted the folder, dled the whole thing all over again, installed and patched, tried the same thing. Didn't work. Replaced the setup.exe. Didn't work. Now this is all it shows me when I start it up and how the setup looks as well:
http://i40.tinypic.com/2wmm7p4.jpg
http://i39.tinypic.com/wa61rd.png
Someone suggested to me to try restoring my computer to yesterday so that it'll go back to normal. but I'd rather just see if I can solve the issue.