Once infected repairing of these files is very much difficult. Macro Virus: These type of virus infects word, excel, PowerPoint, access and other data files. It is important to note that a virus cannot be spread without a human action, such as running an infected program to keep it going. Almost all viruses are attached to an executable file, which means the virus may exist on your computer but it actually cannot infect your computer unless you run or open the malicious program. So before you download anything from the internet, be sure about it first. They can be hidden in a free/trial softwares or other files that you download. Viruses also enters through downloads on the Internet. Viruses can enter to your computer as an attachment of images, greeting, or audio / video files. A computer Virus is more dangerous than a computer worm as it makes changes or deletes your files while worms only replicates itself with out making changes to your files/data. A virus might corrupt or delete data on your computer. Virus is a program written to enter to your computer and damage/alter your files/data. So wherever a malware term is used it means a program which is designed to damage your computer it may be a virus, worm or Trojan. Malware is designed to cause damage to a stand-alone computer or a networked pc. "Malware" is short for malicious software and used as a single term to refer to virus, spy ware, worm etc.
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