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Kaspersky Internet Security 2013 helps you to protect your computer against any harm threat like viruses and can identify those suspicious websites. But this is not free, you can buy or download the 30 days free trial at this link

To install this to your computer, follow the instruction given below:
Step 1: Double click the setup, if you ask for a permission to make changes to your computer just allow it.
Step 2: Select the “I want to participate in the Kaspersky Security Network (KSN)” then Click Install.
Step 3: Then wait until it’s done then select Start Kaspersky.