"Do I have to reinstall Fedora? or are there commands I can type?"
The automated update system has screwed up and made a mess of your rpm package set. You can log in as root and try to straighten out the mess by hand. To log in as root when you get the respawn mesage use the three finger command <Ctrl> <Alt> <F3> This will get you a login prompt. Login as root and you will be at a command prompt. Use the command:
rpm -qa | sort > /root/packages.txt
to create a list of all of your rpm packages. You can use:
to look through the packages that you have installed.
"some started to install but I received some error messages."
Take a look at the packages that were listed in the install error messages and see if you can find duplicate packages or missing packages.
Here is a thread that explains what to do with duplicate packages:
If you have messages about missing dependencies then you have missing packages. In that case you should install the missing package from either the install CD or by downloading the package. Use command line rpm to do the install.
If you cannot get the problem straightened out the way I described above then you will have to reinstall Fedora Core 1 to get a good working set of installed packages.
Be prepared. Create a LifeBoat CD.