Many times your get programs or web applications for free, but at the price of tracking cookies, etc. I like to use Lavasoft's Adware, Spybot Search & Destroy and Microsoft Defender as my constant companions on the Web, and they are all free. However, I am a firm believer that if you use Lavasoft and Spyware, it is a good idea to support them with some cash to help support their further development.

The article in their FAQs is something that I recommend to friends who are installing these programs to clarify the issue.

Thanks to knowmate Mike McLeod for sharing these resources

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