I don`t think he can use gsdx9 sse2 because he has an athlon xp 2000+ (which doesn`t have sse2 instructions set). Just use the normal version (gsdx9 0.8) with pixel shaders 1.4, of course.
Also, he can`t use vurec (again, because he doesn`t have sse2), and there isn`t really a need to use it. Disgaea is a 2D game, and 2D games work best in Recompiler without vurec (only 3D games get more speed if you use vurec).