1. An Antivirus program.
2. An enabled firewall.
3. An Antispyware program.
4. All of the applicable Microsoft Windows updates.

via yourhub

pic via derbyshire

1. Never disclose your personal details to people online.
2. Don't respond to suspicious e-mails.
3. Don't click links in suspicious e-mails.
4. Delete suspicious e-mails and move on.
5. Update your Anti-virus Definitions.
6. Install Windows defender, if you are using Microsoft Windows.
7. Install McAfee Site Advisor, to know the details about a link in search engines like Google or Yahoo before you click that link.
8. Never accept friendship invitations from unknown peoples in the social community networks.
9. Use Strong Passwords for your email account and other social community network accounts.

via skvnet

1. Use an anti virus program
2. Checking the authenticity of the website
3. Using anonymous surfing software and proxy
4. Setting up password on the wireless network
5. Using a safer web browser

via discountedsoftware