Can't seem to install DirectX 9.0c

[ThyLaSlain]

I am running Windows XP Pro and have DirectX 9.0b installed but we need 9.0c to run the Sims 2.

Whenever I run the sims 2 (and the new bodyshop that came with it) the following message appears:

Failed to initialize Direct3D. Please make sure DirectX 9.0c has been installed on this system. The application will now terminate.

I've TRIED to install 9.0c and according to my computer it has installed, and that it's ready for use but when i go to dxdiag it says I'm still running 9.0b

I am using a Raedon 7000 series for a display card and had downloaded the latest version from the website - http://www.ati.com (http://www.ati.com/)

what am I doing wrong?!

[ThyLaSlain]

This is what my installing thing looks like, below:
as you can see, it completely skips the bit where it's supposed to actually LOAD the stuff onto my comp.

[PLEASE NOTE: IT IS A GIF FILE, IT'S ON LOOP]