nvidia driver problem after update

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http://askubuntu.com – I know there are a lot of posts about nvdia driver, but I am not able to solve this. I updated my configuration yesterday, September 27th, and it seems that a new nvidia driver was involved. The updated completed with an error, and invited me to send a bug report automatically. I send it, but it finally said that there was no place to send the bug report to. Today I updated again, and a new kernel was there. Then I rebooted. I found a desktop in 640x480 with a horrible, unreadable font. I run jockey and tried to go back to another version of the nvidia driver, but it seems that none of the (HowTos)