updating or changing the nvidia driver

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Hello every one,

I have nouveau installed as the driver of my graphic card which is Nvidia Quadro, but it seems that it is an open source nvidia driver, since I have some problems working with software (Ansys Workbench). Before that I should say that when I was trying to look up the version of the graphic card, I encountered this:

[solmaz@napoli ~]$ glxinfo | grep OpenGL
libGL error: failed to load driver: nouveau
libGL error: Try again with LIBGL_DEBUG=verbose for more details.
OpenGL vendor string: Mesa Project
OpenGL renderer string: Software Rasterizer
OpenGL version string: 2.1 Mesa 9.0-devel
OpenGL shading language version string: 1.20
OpenGL extensions:

So I think I need to replace the current driver with a proprietary one, I want to know if it's really the problem? If yes, from where I can download this driver?

By the way the arch I work with is Red Hat Enterprise Linux Workstation, Release 6.4 (santiago).

Any help would be really appreciated.