Protect Computer Against Virus and Worm Attacks

As the Internet becomes more and more integrated into everyday lives, we must learn how to protect  ourselves against new types of online attacks. 

What Can Malware Do to My PC?
Malware opens up backdoors on infected systems, giving hackers direct access to the hijacked PC. 

Don't open email messages from unfamiliar senders, or email attachments that you don't recognize
Many viruses are attached to email messages and will spread as soon as you open the email attachment. It's best not to open any attachment unless it is something you are expecting. 

know how to remove virus from your PC without using antivirus program : 

http://itsecurity-india.blogspot.in/p/security.html

What About P2P?
Peer-to-peer (P2P) networking has become a launching pad for viruses. Attackers incorporate spyware, viruses, Trojan horses, and worms into their free downloads.  

Install an antivirus program. 
Some antivirus programs are sold with annual subscriptions that can be renewed as needed, but many are also available for free.

Use a pop-up blocker with your browser
Pop-up windows are small browser windows that appear on top of the website you're viewing. Although most are created by advertisers, they can also contain malicious or unsafe code. A pop-up blocker can prevent some or all of these windows from appearing.