If X doesn't start perhaps you selected the incorrect video driver, but you're good to go anyway.
Run the installer, follow the instructions and modify the XF86Config file at /etc/X11/ with "vi"
"vi" is the linux console command for "edit".
I suppose you've never used vi, so here's a quick how-to.
Login as root (if you forgot the password, reformat and reinstall).
Make a backup copy of the XF86Config file just in case. Do the following from a command line:
cp XF86Config XF86Config-backup
Enter the "vi" command and BEFORE making any modification, press the INSERT key ONCE. You will be able to move the cursor freely. Make the modifications according to the README.
Once you're done, press ESC
After that press the "w" key. This will save the changes.
Finally, press the "q" key to exit.
Take you're time to make the changes. Recheck two or three times (print the guide if you must).
Once you've finished, enter the following command to go directly to the root account:
Or you may enter the following command to go to the login screen:
If something went wrong, you may replace the modified XF86Config file with the following expression:
cp XF86Config-backup XF86Config
You may come back and post (as attachment) the modified file if you need further help.
The most frequent downfall is the lack of kernel-sources. You will need them for the installer to work.
Everytime you change your kernel, you have to reinstall the drivers. But the XF86Config thingie should be done only once.
All the process must be done as root, even running the installer.
You can run the installer as follows.
If you can't run it, try the following:
chmod +x nvidia-installer.whatever.sh
This will make the script executable. Try again.
If everything fails, login at nvnews and ask away!!!