Windows Media Player will open and run this kind of file. .scr - This extension indicates a screen saver file. .sit - This extension indicates a Macintosh archive StuffIt file. They will not open on a Windows system without a special utility. .ttf - This extension indicates a font especially designed for use on a Windows system. This article will describe what viruses are and then point you in the direction of some rather unique protection and prevention. In short, a computer virus is a software program designed to destroy or steal data. It attacks computers via distribution - often unknowingly - through email attachments, software downloads, and even some types of advanced web scripting. Other tools available online operate similar to the way that AOL's Parental Control settings work, however no collection of tools could replace the reinforcement of mom and dad. Never let your children speak with strangers and never leave them alone at the computer unattended. Children just don't have the experience that adults have and they don't have the skills required to handle inappropriate conversations, emails, or images found online. In addition, you'll need to figure in costs for maintenance, servicing, and insuring. 4. Start comparison shopping and look for the "fastest and biggest." By "fastest and biggest," we mean the computer with the fastest processor, the fastest modem, the biggest memory, and the biggest hard drive capacity. CleanSweep is a unique program that will specifically seek out files that are no longer associated with a program, and then ask if you want to delete them. The only time that you wouldn't want to delete an orphan file is if the file were an actual document that you created before deleting a program. If you were to say, uninstall Microsoft Word, all the documents that you created with Word would then turn into orphan files. Gas stations are self-serviced through a menu-clad touch screen kiosk. Most cash registers are Windows XP or Vista machines that send purchase details back to headquarters via the Internet (or a small Intranet). Having your weight, blood pressure, and heart rate measured and recorded is now a digitized process.