How To Protect Your computer from Virus Computer virus are programs that may damage computer software and can copy itself and infect a computer . Virus can damage computer software,like a file executable(exe),jpg,doc,mp3,etc.Virus have five criteria : First, The ability of a virus to obtain information In general, a virus requires a list of file names that exist in a directory.So that it can identify what programs Just who will file infected by virus.Like a macro viruses that will infect all files document. Second, His ability to examine a program A virus can also check a file that will be infected and virus will infect programs *. doc extension, then the virus will check the file was ducumen have been infected or not, because if it is, will again useless to infect. Third, His ability to reproduce and transmit viruses have the ability to copy itself by infecting other files A virus if the virus has been found a victim will recognize it by check if not already infected with the virus will start by writing the byte transmission identifier in the file, and so on copy / write the object code of the virus on top of target file. Fourth, His ability to manipulate viruses have the ability to survive for a file virus can not be deleted viruses usually do manipulations such as, mendisabled Task Manager, command prompt, run, regedit or the ability to display a message when the computer is on the run Fifth, His ability to conceal themselves The ability to hide themselves must be owned by a virus for all good job from the beginning to the success of transmission can be accomplished. the usual steps are: -original program / virus is stored in coded form and machines combined with Other programs that are considered useful by the user. -virus program is put on the boot record or tracks that rarely note by the computer itself -virus program is made as short as possible, and the results are not infected files changing size -The virus does not change the description of time a file , etc. Virus can spread with the Internet.Internet is one medium for distributing viruses,because when we download files such as mp3, doc, exe, etc.We do not scan that file with antivirus.it can make your computer got a virus.when virus infected computer,it can make the computer became error or crash so you must install your pc.To protect it There are three ways to remove viruses from your computer. First, Install Anti-Virus Software Antivirus helps you to find the virus and delete it.There are many type popular antivirus from local and nonlocal.Local like SMADAV and ansav. They are completely free and Very good from the other.nonlocal like AVG,Avast,Kaspersky,one of the best type is Kaspersky because it best of the detection rates but not free.Do not forget to Update Anti-Virus.because the virus every day there are always new. if not updated,it is impossible to detect new viruses. Second, Delete Unknown Emails if you receive email from someone,or from random people’s names,do not to open the email, just delete it.If you have any doubts after reading the name and the subject,it’s not someone you know.do not download or open attachments.from someone you did not know.probably one of the attachments that are viruses. Third Avoid porn Web Sites if you like to visit porn sites,be careful because sometimes the services of such sites insert a virus or or spyware on his website.spyware it is a malicious software or malware to stole data from computer user will be stored in the spyware owner. In short,be careful when we download, mail, browse, etc.If the virus keep attack your computer mybe you can use anti virus to scan your computer .Do not forget to upgrade your anti virus because it can help you to destroy virus and protect your computer.And if You don not have antivirus you can destroy with manual step.You can destroy with command prompt,to delete virus easily.