Malware is always growing and changing as new kinds of viruses and othermalicious software is developed to infect and bring havoc into your computer. In anenvironment where almost the entire world is computer-driven, this is extraimportant to know.Our report concerned malware and it's abilities to infect computer devices indifferent ways.We approached this by doing a theoretical investigation on malware and testingdifferent free anti-virus programs.Our results was that there can be big differences in how good an anti-virus programis in terms of performance and if they actually find viruses or not, so it's importantto make a good choice.IV