[CentOS] nvidia failure with new kernel

I installed TrueCrypt and when I ran it, it informed me that I needed a new kernel. So I ran "yum update". I boot to level 3, and when I ran startx, I got:

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... (==) Using config file: "/etc/X11/xorg.conf" FATAL: Module nvidia not found. (EE) NVIDIA: Failed to load the NVIDIA kernel module. Please check your (EE) NVIDIA: system's kernel log for additional error messages. (EE) Failed to load module "nvidia" (module-specific error, 0) (EE) No drivers available.

Fatal server error: no screens found XIO: fatal IO error 104 (Connection reset by peer) on X server ":0.0" after 0 requests (0 known processed) with 0 events remaining.

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If I boot with the old kernel, I can successfully run startx.

Thanks for your help. Mike.