You installed the driver, but did not configure X to use it. To do so:
At the login prompt in the console (that’s what you’re seeing) login with username and password, and do:
su -c ‘init 3’
su -c ‘sax2 -r -m0=nvidia’
Pick Change Configuration, check and adjust settings where needed, save and exit. X-server (for graphic display) is now configured to use the nvidia driver.
su -c ‘init 5 && exit’
This returns you to the graphic login screen, if all is well. If not, get back and we’ll try to help you.