Not sure the previous reply is much help, since the kernel was installed from apt-get, not a source compile. (Er, scuse my ignorance, but don't Fedora kernels come as RPM?? - anyway... nevermind)
depmod is a tool which checks for module dependencies, and builds a config file telling the kernel module loader what modules are needed to support other modules. Obviously it is run to sort out the dependencies for the NVIDIA modules, but it has actually failed at one of the cpufreq modules, which is completely unrelated and should have been picked up at kernel install time.
Do you have a K7 in the machine? Do you care about power management (ie is this a laptop)?
If the answer is no, I would say just delete the offending file (powernow-k7-o) and try again.