Trojan Antivirus Attack on my system. How to resolve it?

Major problem of latest world is Viruses. This is the funny thing when we see that the window is clean from the viruses but after that message different pop ups, fake messages and other unwanted stuff show on the screen. So now we need some specific software which can clean the viruses from the computer.
The new virus which prevails in the world of internet is Trojan virus. So there is also different software’s which are used to remove the antivirus. The problem is that when I play any song or movie it will show the message that the file not there.
Or when I go to that folder where I saved the file there will not file. This is the major problem with my PC that the .Exe of my computer is going to be corrupted by this viruses Please send me the latest antivirus which can resolve my problem on Trojan Virus.
Help me
