Several things might go wrong during a kernel compile and install, and several clues point to the true problem. You see error messages printed to the screen, and some error messages are printed to the file
/var/log/messages, which you can examine with a text editor. If you have followed the directions for patching the kernel, you need to examine a special error log, as well. Do not worry about most errors because many problems are easily fixed with some research on your part. Some errors may be unfixable, however, depending on your skill level and the availability of technical information.