There's none. I have one of the best anti-virus and it didn't do a thing. There's lots of "anti-virus" that claim EVERYTHING with a certain coding / file-ending to be a virus.it saids its a virus. any comments on this?
If you have a laptop or something to spare (old and crappy) - clean it of personal files - and go and try out all the things that supposedly has viruses and you'll be surprised that only about 1% of them have actual malware. Most of the time not even worth mentioning. Once you really notice you fucked up that spare OS, go and try different anti-virus to see what they find and cross-check.
Some anti-virus on sensitive setting literally claim EVERY exe file is a virus "because it could be".
The worst malware/viruses are installed by fishy popup sites on dodgy webpages that a normal firewall (even default windows one) blocks automatically and warns you not to go further. Most viruses are still installed by clicking on spam mail links.
It's nice to get more knowledgable in this field just so you can relax and know what is a danger and what isn't - what you should do and what you shouldn't.