Since we're describing a home network that will connect to the Internet, you're strongly advised to install a protective firewall program to thwart Internet viruses, worms, or other damaging spyware code. Firewalls prevent - but they don't repair. Only anti-virus and anti-spyware programs can reverse damage. Some files compress better than others and in some instances, you may not notice that much of a difference. The files that compress the best are images, documents, and multimedia files. Executable files (files that end in an .exe extension) don't compress that well, however when they're archived with a sizable number of other files, they compress rather well. The above illustrations were just a couple of examples of how far computer technology has grown, and how far we've pushed "user-friendliness" to its limit. Eventually, the keyboard and mouse will have to play a role when computer newbies have to work with one as a cash register, as a hotel booking program, or as a library's catalog system. Or if you were to uninstall a graphics-editing program, all the pictures you made with the program would become orphan files. The smart thing to do when you don't want to lose the data that you created with an unwanted program is to: 1. Save or convert your documents to a format that will work with different program first (that is, a program that you intend to keep) 2. Basically, computer errors are the result of a number of things that may or may not have anything to do with the way the computer is used. They "operate" whenever there's a conflict among commands. Remember that computers essentially run off of a series of commands and it's usually a smooth process. Even ordering a pizza is now a simple matter of dialing from a wireless cell phone and making a few selections from series of pre-programmed menus! The important thing to realize here is that this phenomenon isn't a new convenience - it's a new requirement. And if you haven't jumped onto the binary wagon, you're going to face a few problems.