Castlevania: Death's Premonition, Help Me!

[Jam0864]

You just have to change the calls for directx to opengl as far as I know.

ATI Drivers
http://ati.amd.com/support/driver.HTML

Nvidia Drivers
http://www.nvidia.com/Download/index.aspx?lang=en-us

[Rubix Cube]

Is it 'GL_ARB_texture_rectangle' that you're referring to? If so, that will only freeze up the map editor sometimes (you just need to reopen it, no data loss involved) and the weather effects won't work, asides from fade to color.
Besides for the technical issues, is everything else ok?

[bluemonkmn]

You could try removing the validation for GL_TEXTURE_RECTANGLE_ARB (or whatever it's called) from Display.cs and see if it'll run anyway.  Otherwise, it shouldn't be hard to update your drivers by visiting the support section of your video card manufacturer's web site.  But that doesn't always fix the problem.