What is the best free downloadable virus & Adware programs?

No Single security application can prevent your PC from intrusion/getting infection.
If you are looking for some free stuff then I will recommend you to use Adware-SE, superantispy and Spybot S&D (search for these application on net, to download them). Also scan your PC with some good Anti-Virus. AVG is a good one. Use some good firewall application (like ZoneAlarm) to protect your PC from unauthorized access (in-coming and Out-going).

HOW TO DELETE VIRUS AND SPYWARE AND ADWARE WITH SPYZOOKA

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