Nvidia driver 290.10 or 173 from additional drivers package?

I use Ubuntu 11.10. If I installed the last driver from the Nvidia website do I still need the additional driver module? I use Nvidia version 290.10 when I look at the Nvidia X-server but when I look at the additional driver module it gives driver 173 in use. I have a GEFORCE 6200. I am confused by this. Should I delete a package?