so I imagine the ideal bodyguard for your PC. F-Secure Anti Virus meets these criteria. It protects my PC now for one year against all harmful goods. I am very satisfied, the program runs in the background and consumes little power. The installation was very easy, even if I have the key not the same found :)! Once installed it scans the same lot that happened very quickly for me. The basic settings I have not changed, because I trust times on the system / developer.