That fellow is the main packager for the Fedora NVidia videocard drivers as packaged for the Livna repository. He has several FAQ there on his blog on how to get all this multimedia stuff done without breaking things (like what happened to you).
No one here advised you to download the source files and manually install them. You can do that with proper preparation but it is not the way hardly anyone installs software in Linux these days. Heck, even Gentoo, where everything gets built from source, had the portage system to mostly do it for you.
I suggest you do:
from each of the folders that you manually installed that way.
Then go to Firewing's blog or even another FAQ like:
Make sure to explore that site for lots of great Fedora 7 help.
That fellow has similar easy ways to get things done.
And the Fedora forums as well as the Fedora specific forum right here at LQ have a wealth of information that'll help you.
You did it the hard way, which is quite possible to do but it would take research into installing the proper dependencies first and removing anything on your system that might conflict, all on your own
See why everyone uses package managers that automatically keep track of all this stuff?
You did it the Windows way. Not gonna work on Linux. Linux is MUCH easier, but you need to spend a brief period reading in order to understand how to use these things. Very easy tools are there for you in all the major distro's. Use them.