TechRepublic has the:
10 dumb things users do that can mess up their computers
#1: 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.
#2: 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.
#3: 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.
More sound advise can be found here
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