The same driver isn't being installed during every Ubuntu 12.04 install

The same driver isn't being installed during every Ubuntu 12.04 install

I have installed Ubuntu 12.04 several times, and during installation
sometimes the version 304 Nvidia driver gets installed sometimes the
version 173. I checked the integrity of the DVD, of course. I'm just
asking if it could cause some kind problem or not, should I be worried, or
calm? hehehe