That is a problem...
You can re-run the Xconfigurator, and that will re-write your XF86Config file such that the NV drivers are installed.
I would suggest that you use the RPMs :
These are source rpms, which is what you want since your kernel version is probably not the same as what they built the rpms against.
To rebuild source rpms do :
rpmbuild --rebuild [name of rpm]
This will output the rebuilt rpm somewhere (on RH, /usr/src/Redhat/BUILD/SRPMS, I think).
You can then install the rebuilt rpms with the normal rpm -ivh command.
I would try that first, then run Xconfigurator.