Go into your RO folder and check the following:
you don't have a data folder, if you do remove it.
your sdata.grf is over 1 GB, if not update your sakray or download a more recent sakray or download our full hero installer.
Run your setup.exe and make sure the proper options are chosen.
If none of this helps, take a screenshot of your RO folder, host it and post the image here, we'll help you finding what's wrong.
Kevin, you need to use http://tinypic.com/ to host/upload your picture then post the link here so we can see it. Uploading directly to the forum doesn't work sorry.