If you use your computers for surfing net you are always prone to virus or malware attacks, but without Internet computer is almost useless. My computer once became dead slow because of some malware programs which finally got cleaned by MalwareBytes. Downloading free games some times carry mischievous programs with it. Some of them are just meant for advertising or checking our internet habits while others have highly dangerous missions. Like a key-logger virus can practically tell the scammer your activities in a computer. Your sensitive login and card details could be compromised in this way. It is always better to avoid third party sites while downloading games and software. Try to get it directly from the publisher's site.