If you are using a Windows machine or even a Mac running Windows in a virtual environment, you need to pay attention to security. At the very least, you should always have at least one program for each of the major security threats: antispyware, antivirus, and a software firewall (if you don't already have a router-based firewall). Some antivirus suites have begun to include antispyware in their software, so if you have antivirus software, check to make sure you're covered. But if you're reading this and you don't have software to cover these three areas, we strongly suggest you visit our Download Security Center and browse through each of the categories.
To get you started, we've rounded up the top free antispyware software options. Most of these programs offer a paid upgrade with added useful features, but we made sure to only pick software that followed through and removed spyware without the need to buy during the initial trial. It's important to note that each of these programs has its own set of algorithms and different times they update their definitions, so we recommend using two antispyware programs to make sure you catch everything.