Try replacing Tsukihime EXE with the newest version of onscripter:
nscr.exe.. rename that to tsukihime exe and replace it in Tsukihime?s game folder. This is the newest nscripter build and uses DirectX video acceleration instead of the old software method. It will be MUCH MUCH faster and the interface will be exactly how it should be, plus you will get improved image quality (with the option to force override the refresh rate in your ATI/nVidia drivers - something I HIGHLY recommend unless you have an LCD display).
Use nscr.exe to replace every EXE for every Type-Moon game you have (except Fate Stay Night). The newest nscripter will run much better for you, I am sure.