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Avoid clicking on everything. Beware of misleading pop-ups. Clear your cache. Do not contact numbers in tech support scams. Be selective with your downloads. Look at the extensions for files you're considering opening. Scan your downloaded files. Don't open anything you don't trust completely. Read the license agreement. Don't download attachments from a source you don't know. Don't download attachments from a source you do know unless you were expecting it. Disable image previews. Beware of odd emails from companies you do business with. Be careful with USB drives. Be wary about remote access.
There are thousands of banner ads and pop-ups on the internet that are designed to get your attention and make you click. Due to the way most modern browsers work, there are very few ways for you to get infected with something online unless you click on it yourself. This means you should avoid clicking on banners for offers that are too good to be true. Make sure your browser is configured to always ask before running files and downloading automatically. If you have to confirm everything, you are much less likely to get infected. Some of the most nefarious pop-ups on the internet are designed to mimic the look of legitimate anti-virus software. These pop-ups attempt to trick the user into thinking their antivirus software has found an infection. When you click the pop-up, however, the adware is actually installed. Instead of clicking the warning, close the pop-up window and open the antivirus program on your computer. You most likely will not see any warnings. If you are still worried, run a scan using your installed software. Don't try clicking the "X" to close the pop-up window, as this will usually lead to more pop-ups. Instead, use the Task Manager to get rid of it. Alternatively, you can install and use an adblocker to prevent ads appearing in the first place. Other pop-ups may warn of an infection that only their software can fix. No legitimate antivirus company will advertise their product this way, so avoid clicking on any of these pop-ups. Check to ensure that your browser is configured to block pop-ups. Pop-ups can store information in your browser's cache, leading to them reappearing constantly. To help prevent this, clear your browser's cache regularly. Such scams intend to get your personal details, take control of your computer, demand payment, or install difficult-to-remove malware onto your computer. If you fall for such a scam, report the number to the FTC. Note that real companies will not contact you or give you a number to call if your computer is infected with malware. There are programs available for nearly every task you can think of, but ask yourself if you really need the program that you are about to download. Do a little research about your task; you may find that you already have a program capable of what you want to do. Downloading extra programs for every task you want to complete increases the likelihood that you'll download something malicious. Mischievous files often have fake extensions designed to trick you, such as ".txt.vb" or ".jpg.exe". Windows will often hide common file extensions to make browsing through your files and programs more visually appealing. Double extensions exploit this by hiding the second, dangerous extension. If you normally don't see extensions on your computer and it all of a sudden appears on a file that you've downloaded, you may have downloaded a malicious file that is hiding as something else. To make your file extensions visible, open Windows Explorer, click the View tab/menu and select Options. Click the View tab in the Folder Options window and uncheck the "Hide extensions for known file types" box. If you have an antivirus program installed, you should make a habit of scanning files that you've downloaded from unknown locations. Most antivirus programs allow you to immediately scan specific files by right-clicking on the file and selecting your antivirus from the list of options. Always scan ZIP files as these often contain multiple files in one archive. Email programs will often scan your email files for viruses automatically, but you should still scan any downloaded files with your own antivirus program. Both Windows and Mac scan downloaded files to stop malware. A virus or worm can do nothing unless you actually run the program that it is attached to. That means that simply downloading a file does not put you in any real danger. If you decide after downloading that you don't exactly trust the file, avoid opening it or delete it until you can confirm its integrity. You know those legal documents that you always blindly accept when installing a program? Well, shady companies like to use the fact that most people skip them to sneak in clauses about installing spyware and other malicious software. Make sure to take the time to read these agreements, especially from companies that you've never heard of before. Also read the privacy policy; if the app collects your data, you want to know how the website uses it. Email attachments are the number 1 way that viruses and other malware get spread. You should never click an attachment or link in an email from someone you don't recognize. If you are unsure of the sender, get confirmation from them that the file is legitimate before downloading it. Many times, people will get infected with viruses that send emails without their knowledge. This means you can receive email from trusted sources but the email itself is not trustworthy. If the writing is odd or the attachment looks off, do not click it. Verify with the person that they intended to send you the attachment you received. Many email applications can automatically load images for convenience, but this can leave you more vulnerable, as images can contain malicious code. You should only download the images in an email from a trusted source. Note: Some services have started changing way email images are handled, making image loading safer. For example, Gmail no longer disables images on default. Check with your mail provider for the best practices on their service. A popular phishing technique is to copy the style of a company email and include links that look similar to the regular URL, but instead send you to a fake site ("povver" instead of "power", for example). These sites then collect personal information that you thought was going to a trusted server. Any legitimate company will never ask you for passwords or other personal information through email. USB drives are a popular vehicle for virus transmissions, usually without the owner being aware at all. You could get an infection just by inserting the USB drive in your computer (if autoplay is enabled for removable media, which it is by default), or you could get your USB drive infected by plugging it into a public computer (or even a friend's unprotected computer) that might already be infected, especially if many unknown people connect their USB drives to the computer. You can use other methods for file sharing, such as online storage or email to send files. Or you can disable autoplay for removable media on your PC which will prevent your PC getting infected automatically via USB and make sure you scan the drive with your antivirus after you plugged it into a strange computer (if you are an advanced user you can check if the autorun.inf file on the drive was edited and if there is an open command in it that links to the virus (Make sure show hidden and system files is enabled) or if all the real files on the drive was were hidden and replaced by shortcuts with the same name that link to the virus). You can disable autoplay for USB drives by searching for autoplay settings or going to Control Panel > Default Programs > Change autoplay settings, then uncheck use AutoPlay for all media and devices, then go to removable drive and say take no action. This is an easy way to prevent inadvertently getting a virus by sticking an infected drive in your computer and from spreading a USB virus;however, this will not prevent your USB drive from getting infected if you stick it in a strange computer. So make sure you scan it regularly or even set an icon for the drive in the autorun.inf file and if the icon disappears you know your drive has been infected. In our more connected world, remote access and remote sharing of resources has become much more prevalent. While this can be great for productivity, it does put your personal machine at more risk if there are a variety of other machines connecting directly to it. Ask yourself if you need that remote connection, and always ensure that your protection software is up to date.