PC security is becoming the biggest challenge to PC users today because of the increasing activities of viruses, malware and other online threats. Computers and mobile devices face threats from viruses and particularly those running on Windows operating system (OS) are more vulnerable to viruses and malware. Viruses very rarely are not harmful but mostly they are very much so and can steal or destroy data and information that you exchange while browsing or downloading. By following some simple tips you can prevent virus attacks to reduce the risk to a minimum. It is not possible to protect your PC by just installing antivirus software as you are open to threats as long as you are connected via the internet. Viruses can get into your system through a CD, USB, software or other unprotected sources.Below mentioned are the tips that can help you keep viruses out of your system:Check your operating systemSoftware and OS play an important role in determining your PC’s security. Therefore you have to be extra careful about them. The best way out is to use an OS such as Linux or Macintosh that are less likely to be infected by a virus. In case you have a Windows-based system, then make sure that you have installed the system patches and updates so that virus authors are not able to exploit the vulnerabilities. You are recommended to use security patches even for web browsers especially if you are using Internet Explorer. The other way out is to use more secure browsers such as Mozilla Firefox or Opera.Install antivirus softwareInstalling antivirus software is the step from which PC security begins for every internet user. Such software provide you security from viruses and malware by maintaining a database of viruses and related threats, periodic scan of your entire system to find out threats and thus preventing threats to the system before they are caused. One essential condition to make antivirus software work is to keep it running 24×7 and updated. In case you are not willing to spend on antivirus software then even freeware will work for the moment.Use a secure internet connection and firewallYou should always try to use a secured internet connection as it reduces the chances of virus contraction. Furthermore, enable firewall on your computer to restrict unsolicited e-mails carrying potential virus threats. You can easily install the firewall by using setting of your PC with which it can be turned ‘on’ or ‘off.’ Use of firewall becomes easier for you if you are using a wireless router because it often carries a firewall. If you are using a PC connected to a larger network of a corporate or institution, the network administrator will let you know about the steps you need to take to safeguard your system so that the entire network remains secure.Don’t trust unidentified e-mails and attachmentsIt is the thumb rule of PC security to delete unknown e-mails and attachments as they are exploited by virus authors to send viruses to your computer. You should abstain from installing software from unreliable sources, clicking on pop-up advertisements and visiting redirected websites. By doing these you can reduce the number of security incidents to half and prevent most security related problems. Always prefer to install antivirus software that verifies incoming e-mails, enabled with the quarantine feature to block infected and unsolicited files.The tips mentioned above in the article have been tried and found very advantageous for internet users. By following them you can prevent viruses from attacking your system. Apart from these, one thing that is most important is to be vigilant and ignore websites that are either not reputed or unknown.