None of the AVs mentioned before will protect you from viruses if your yet another superficialit, knowless internet user like most of them. Be very carefull when downloading software from torrents, unofficial sites etc. Nowadays every kid without programming knowledge can get a FUD keylogger for few bux. So don't wonder why your tibia account got hacked after you downloaded elfbot and virustotal shoved that it's 0/43. If AVs doesn't detect anything, it doesn't at all mean the file is clean. So yeah... study the most common types of cracking, so you can avoid them, watch ya self or switch to unix as some guys already mentioned before.