There is an NVIDIA Linux Driver web forum. You can access it by going to http://www.nvnews.net and following the "Forum" and "Linux Discussion Area" links. This is the preferable tool for seeking help; users can post questions, answer other users' questions, and search the archives of previous postings.
If all else fails, you can contact NVIDIA for support at:
But please, only send email to this address after you have explored
the Frequently Asked Questions and
Common Problems chapters of this
document, and asked for help on the nvnews.net web forum. When
please include the
nvidia-bug-report.log file generated by the
script (which is installed as part of driver installation).