The main problem that most people notice with either kind of program is that they cause performance issues with their computers. For example, Internet Explorer might not work properly any more, your computer might hang more frequently, or your computer might slow down significantly. Removing spyware successfully is difficult enough to make preventing it in the first place a priority.
Unauthorized adware and spyware usually install on your computer covertly by using one of two methods:
Tricking you into clicking a link that installs it. Links to spyware can be deceptive. For example, a Web site that's trying to push spyware onto your computer might open a window that looks like a Windows dialog box, and then trick you by installing when you click a Cancel button to close the dialog box. Sometimes, spyware pushers will put a fake title bar in an empty window, and then install spyware when you try closing the window. | |
| • | Installing freeware that includes it. For example, you might install a free file-sharing program that surreptitiously installs spyware on your computer. File-sharing programs can be a major conveyor of adware. |
Once installed, spyware can transmit your personal information and download advertisements 24 hours a day. It can also hijack your browser settings, such as your home page or search page.
Protect against Spyware and Adware
Without help, you have no way to prevent adware or spyware. Old antivirus programs don't even prevent adware, since they didn't consider them viruses or worms. First, you usually give permission to install adware, although you do so unwittingly because adware and spyware pushers are deceptive. Second, adware doesn't behave like a typical virus or worm. They don't usually do actual damage to your computer, other than wrecking its performance, and they don't spread themselves using your address book. (Although some kinds of adware can break your anti-spyware tools.)
Things are changing for the better, though. Most popular antivirus products now include adware and spyware scanning. For example, the latest versions of McAfee VirusScan, Norton AntiVirus 2004, and Trend Micro PC-Cillin 2004 now scan for some adware and spyware.
Also, some Internet service providers (ISPs) are introducing protection from adware and spyware. For example, America Online (AOL) announced in January spyware protection as an enhancement for AOL 9.0 Optimized. EarthLink also provides adware and spyware protection through the latest version of its software. Of course, to take advantage of the built-in protection that antivirus products and ISPs provide, you have to update to the latest versions, and keep the anti-spyware/adware signatures current.
