please tell me how i can install rhe new version of kernel of fedora core 5

do you have the kernel in rpm format or you just have the source tarball?
if you have a kernel rpm, you can do rpm -Uvh <kernel-rpm-file-name>
be aware of the changes that will be made to your /boot, namely the /boot/vmlinux symlink file.
you may also need to run mkinitrd after you install a new kernel.
if you have the kernel in source tarball from kernel.org, then you unpack it and copy the config file that was used for your running kernel, /boot/config-XXXXXX where the XXXXX is the kernel version. you copy that file to .config in the unpacked src tree and then you run make oldconfig modules modules_install bzImage

Please give me more details so I could try to assist you better