Okay, seeing your distro is RH7.3, I'm guessing that you downloaded an rpm off the net from the kde site, and now you've got all sorts of dependecy problems. If you're not familiar with dependency problems, they are simply files/programs that are needed to run the program you are trying to install.
My guess is that your RH version is simply too out of date. Not that it won't work, but you'll have to find and download all the files that you need to reach a point that all your old files are downloaded, and you meet all the dependencies. This may take a little effort to locate them, but it's prety easy to overcome.