3. Lock down your browser
One of the most prevalent means for spyware and adware to be installed is through Internet Explorer. To prevent spyware and adware from installing without your knowledge and permission, you need to "lock down" Internet Explorer. There are several ways to do this.
Securely configure the Internet zone
First, you can securely configure the Internet zone of Internet Explorer and add sites that you trust to the Trusted sites zone. This means that by default web sites will not be able to use "active content" (i.e., ActiveX controls, Java applets, and scripting) until you explicitly choose to trust those web sites. See this page for instructions on how to securely configure Internet Explorer:
Internet Explorer Privacy & Security Settings
By turns, you could also use this free program, which will automatically configure Internet Explorer for you:
Enough is Enough!
One potential downside to securely configuring the Internet zone is that some web sites will not work properly until you add them to the Trusted sites zone -- a process that some users find cumbersome.
Add bad sites to the Restricted sites zone
Second, you can use another approach to "locking down" Internet Explorer which avoids the hassle of broken web sites by adding known "nasty" sites to the Restricted sites zone. Doing so gives your PC protection against known threats while still allowing most web sites to work by default. To put the clamp down on a long list of undesirable web sites, you can install and use this free program:
IE-SPYAD
If you choose to use the Restricted sites approach of IE-SPYAD, be sure to update your copy of IE-SPYAD regularly, as new web sites are constantly being added to the list.
4. Use an alternative browser
Internet Explorer is not only the most popular browser on the Net, it is also the browser most widely and easily exploited by spyware pushers to install spyware and adware behind users' backs. Thus, you might decide that Internet Explorer is simply not worth the hassle or risk. In that case, you can install and run an alternative, non-IE browser such as:
Mozilla
Firefox
Opera
All three of these browsers are mature, robust, and fast. Moreover, they have built-in pop-up blocking and several other nice features that Internet Explorer simply lacks. More importantly, all three of these browsers are much less susceptible to unwanted adware and spyware installations. And all three are free.
Note: even if you do switch to an alternative browser, you should still lock down Internet Explorer, as described above. Given that Internet Explorer has effectively been integrated into Windows, it can still be exploited by adware and spyware that gets installed to your system through other means. Thus, locking down Internet Explorer remains important even if you're not regularly using Internet Explorer to browse the internet.
5. Keep your system safe & secure with Windows Update
To prevent unwanted spyware and adware from being installed behind your back, you need to install all the latest "Critical Updates" from Microsoft. Doing so is easier than you might think.
Microsoft has an entire Windows Update site devoted to automatically updating users' systems with all the latest fixes and patches for a wide range of Microsoft software, including Windows, Office (Word, Excel, PowerPoint, Access), and Internet Explorer.
We strongly urge you to take your system past the Windows Update site and let that site download and install the appropriate fixes for your computer. Doing so just might save you some grief and headaches down the road:
Windows Update
http://windowsupdate.microsoft.com/
Much of the update process at Windows Update is automated, so it's simple and convenient. The Windows Update site will install a small program to analyze the software on your system and recommend the appropriate fixes. This process takes only a few minutes.
Once Windows Update has finished analyzing your system, you'll be presented with a menu of downloads that Windows Update deems appropriate for your computer. At a minimum you should let Windows Update install the fixes marked as "Critical Updates." The other available updates ("Recommended Updates," "Drivers and Enhancements") are optional.
Check the boxes for the updates that you wish to install ("Critical Updates" are checked by default). Then click the appropriate button to start the download and installation process. You'll be shown a summary of the updates that you've selected, and then you'll presented with a "License Agreement." After you click through the "License Agreement," the download and intallation process will start.
Since the entire download and installation process is automated, there's almost nothing for you to do except reboot the computer after all the updates have been installed.
6. Read Licenses & Privacy Policies
Anti-spyware applications alone can't protect you entirely from unwanted spyware and adware. You have to do your part as well by being vigilant in your online behavior.
One of the more common sources for spyware and adware is "freeware" (e.g., Grokster or KaZaA) that bundles unwanted third-party applications. Another common source involves third-party web sites that automatically start the installation of spyware and adware when you visit those sites. These auto-installed spyware and adware programs may initially appear to be plug-ins necessary for the web site itself, though usually they are not.
Wherever you happen to encounter spyware and adware, you will usually be presented with a EULA (End User License Agreement) and/or Privacy Policy. Do not blindly click through these documents. Read them carefully and look for the tell-tale language that discloses the presence of adware or spyware. For tips on what to look for, see these pages:
DSLReports.com - EULAs & Privacy Policies
The Problem with Privacy Policies
Ben Edelman - Grokster and Claria Take Licenses to New Lows
Ben Edelman - Gator's EULA Gone Bad
EULAlyzer (free EULA parsing/analysis tool)
Most if not all of the "adware-supported" or "advertising-supported" applications on the Net have adware-free equivalents. There's simply no need to use advertising-supported applications. If you're looking for truly free software without any unwanted surprises, see the following sites:
CleanSoftware.org OldVersion.com
FreeWindows.dk The OpenCD
GNUWin II The OSSWin Project
Moochers Pricelessware
location
http://www.spywarewarrior.com/rogue_anti-spyware.htm#sites