Plug into the wall without surge protectionSurf the Internet without a firewallNeglect to run or update antivirus and anti-spyware programsInstall and uninstall lots of programs, especially betasKeep disks full and fragmentedOpen all attachmentsClick on everythingShare and share alikePick the wrong passwordsIgnore the need for a backup and recovery planAdditional resourcesVersion historyTell us what you thinkVersion 1.0 May 17, 2006 10 dumb things users do that can mess up their computers By Debra Littlejohn Shinder, MCSE, MVP We all do dumb things now and then, and computer users are no exception. Inadvertently pressing the wrong key combination or innocently clicking OK in the wrong dialog box can change important settings that alter a computer’s behavior or even crash the system. Nervous newbies are often fearful that one wrong move might break the computer forever. Luckily, short of taking a sledge hammer to the box, the consequences aren’t usually quite that dire. Even so, users often do create problems for their computers and for your network. Here's a description of common missteps you can share with your users to help them steer clear of preventable problems. Plug into the wall without surge protection Here’s one that actually can physically destroy your computer equipment, as well as the data it holds. You may think your systems are in danger only during an electrical storm, but anything that interrupts the electrical circuit and then starts the current back again can fry your components. Something as simple as someone turning on an appliance that’s plugged into the same circuit (especially a high voltage one such as a hair dryer, electric heater, or air conditioner) can cause a surge, or a surge may be caused by a tree limb touching a power line. If you have a power outage, you may experience a surge when the electricity comes back on. You can protect your systems against damage from power surges by always using a surge protector, but it’s important to be aware that most cheap surge protectors will survive only a single surge and need to be replaced afterward. An Uninterruptible Power Supply (UPS) is better than a surge protector; it has a battery that keeps power flowing smoothly even when there’s an outage, to give you time to gracefully shut down. Surf the Internet without a firewall Many home users plug their computers right into their spiffy new cable or DSL modems and hop onto the Internet without realizing that they’re putting themselves at risk from viruses and attackers. Every Internet-connected computer should be protected by a firewall; this can be a firewall built into the broadband modem or router, a separate firewall appliance that sits between the modem/router and the computer, a server at the network’s edge running firewall software, or personal firewall software installed on the computer (such as ICF/Windows Firewall built into Windows XP or a third-party firewall program like Kerio or ZoneAlarm). One advantage of personal firewalls on laptop computers is that they’re still with you when you take the computer on the road and plug into a hotel’s DSL or cable port or connect to a wireless hotspot. Just having a firewall isn’t enough, though. You must also be sure it’s turned on and configured properly to protect you. Neglect to run or update antivirus and anti-spyware programs Let’s face it: Antivirus programs can be a royal pain. They’re always blocking some application you want to use, you often have to disable them to install new software, and they have to be updated on a regular basis to do any good. Seems like the subscription is always expiring and prompting you to renew it--for a fee, in many cases. But in today’s environment, you can’t afford to go without virus protection. The malicious programs that AV software detects--viruses, Trojans, worms, etc.--can not only wreak havoc on your system but can spread via your computer to the rest of the network. In extreme cases, they can bring down the whole network. Spyware is another growing threat; these are programs that install themselves on your computer (usually without your knowledge) and collect information from your system that is then sent back to the spyware program’s author or vendor. Antivirus programs often don’t address spyware so it’s important to run a dedicated spyware detection and removal program. 3 2 1 1 Page 1 Copyright ©2006 CNET Networks, Inc. All rights reserved. For more downloads and a free TechRepublic membership, please visit http://techrepublic.com.com/2001-6240-0.html10 dumb things users do that can mess up their computers Install and uninstall lots of programs, especially betas You like to be on the cutting edge, so you often install and try out new software. Beta programs are usually free and give you a chance to sample neat new features before most people. There are also many freeware and shareware programs made available as Internet downloads by their authors. We know you’d never do it, but some users even install pirated software or “warez.” The more programs you install, the more likely you are to run across ones that either include malicious code or that are poorly written and cause your system to behave improperly or crash. The risk is greater with pirated programs. Even if you install only licensed, final-release commercial software, too many installations and uninstallations can gunk up the registry. Not all uninstall routines completely remove program remnants and at the least, this practice can cause your system to slow down over time. You should install only the programs that you really need, stick with legitimate software, and try to minimize the number you install and uninstall. Keep disks full and fragmented One of the results of installing and uninstalling lots of programs (or adding and deleting data of any kind) is that it fragments your disk. Disk fragmentation occurs because of the way information is stored on the disk: On a new, clean disk, when you save a file it’s stored in contiguous sections called clusters. If you delete a file that takes up, for example, five clusters, and then save a new file that takes eight clusters, the first five clusters’ worth of data will be saved in the empty space left by the deletion and the remaining three will be saved in the next empty spaces. That makes the file fragmented, or divided. To access that file, then, the disk’s read heads won’t find all the parts of