Alrighty, I tried to add a fix for the ntitles issue, and improve x64 compatibility. I personally haven't tested the ntitles bug, but I was hoping some others who experience the issue could help with that.
As for the x64 bugs that pop up, in my experience it has been improved, but is still not perfect. I still get the occasional failure on trying to launch the app. Actually, I only had it happen once in a about 30 attempts. I don't know if its simply a fluke since it was so random to begin with, or if it is an actual sign of better results.
Nonetheless, please see if this build is any better. If so, I will update the main topic with the new link, and do the same with RMVX.
RPG Maker XP PortableEDIT:
Also, ensure that you are running it in compatibility mode for Windows XP SP3.