A computer virus is some sort of malicious code that replicates itself and moves from one computer to another through a network. When you own and operate a computer that is connected to the internet, you are almost guaranteed at some point to download a virus. Computer malware and viruses can be incredibly harmful when they infect your PC. Viruses, spyware and malware can cause people's computers to run slowly, lose data and even allow hackers access to people's personal information. Computer viruses and malware can often be incredibly tricky to completely remove, especially if the virus is one of the more aggressive, nasty ones. The two main methods on how to remove computer viruses are running scans and manual removal of computer viruses. Downloading dependable anti-virus software is the best way to remove computer viruses. Once it has been completely installed, you can scan your system to check for the malicious wares that already accessed your system. In just a couple of minutes, you will see the infected programs and files before the anti-virus program will delete it for good. Most of the latest anti viruses have an active shield program built into it. These shields monitor the incoming connections to your computer; and scan them to detect any malicious code that might try to pass through and infect the computer. They also scan the websites you visit by monitoring the cookies and files that they install on your computer.Once the scan is completed, the antivirus would present a report and let you know if your computer is infected. If it is, you can choose to quarantine the virus or delete it completely. Quarantine means to isolate the file, because there is a possibility that any other program requires the file to run. You can also choose to completely delete the file that is infected by the virus. However, there is a new generation of viruses that can escape being detected even by an updated antivirus program. These viruses pretend to be a file that is part of the operating system. They can be detected by running what is called a boot time scan. A boot time scan runs before the operating system loads and thus can detect these viruses and delete them. If these steps do not work, you should back up all your important data and reformat the computer, which involves totally wiping out the hard drive and reinstalling your operating system. Once this is done, the first program that you should install is the antivirus and then update both the operating system and the antivirus program. Make sure you scan the files you have backed up before transferring them back to your hard drive. You must keep the anti virus updated, since new malwares are created from time to time. If the anti-virus program is not up to date with the latest virus releases, there is a chance that it would not detect the malware as it scans. Therefore, the virus will still spread, risking your whole system and your security at the same time.To be safe when it comes to computer virus removal, it is best to take your computer in to a certified technician that has knowledge of the different viruses that are infection computers. They also have all the tools right at their fingertips to properly remove any and all computer infections. You can keep your computer clean and virus free using discretion when downloading software and online programs. If something looks suspicious or sounds too good to be true don't click on the link. The minute the link is clicked you have given the virus free rein to your personal information and computers hard drive.