Apparently, this person had a deep grudge against a popular online service which shall remain unnamed. In this hacker's mind, the online service failed to do a quality job in protecting children from online smut and as retaliation, he created and distributed a virus to as many file libraries of this service as he could. These limitations are often small and don't interfere with the way its full version operations. They're really just implemented as a way to prompt payment. Remember that shareware is not freeware. You shouldn't try to use shareware as commercial software without paying for it. About the only thing that's similar between shareware and commercial software is the way in which they may be bought. Sometimes the links are harmless and attempt to con the reader into volunteering personal information (credit card number), but other times the links attempt to download harmful software onto a computer. Your best protection against computer crimes is your own knowledge. Hopefully the suggestions above will prompt you into taking appropriate action and into protecting your computer with the suggested tools. com" Then, and only then would the program load up for use. This is a small command, but just imagine if you had a program that was deeply nested within a series of folder. You could end up typing a command as wide as your computer screen or worse, long enough that the entire command would have to wrap onto the next line! ), it also stored the drivers that the program needed to communicate with the computer's hardware. As you can imagine, the cumbersome process of switching from floppy to floppy prompted the birth of the operating system. An operating system is a software program that controls how the computer's hardware (and installed software) works. Fortunately you have this article to guide you through some of the most common extensions that you'll run into. But before you can see file extensions, you need to turn them on. From Windows Explorer, click on the "Tools" menu, and select "File Options." Click the "View" tab and then uncheck the box next to "Hide file extensions for known file types.