On another computer, the F-Secure IntrnetSecurity already running with whom I am very satisfied.
The antivirus software I have installed on a desktop PC with Windows 8.1.
That went smoothly, he has the trial, which had since the purchase of the computer on it, properly uninstalled and installed the new software.
Very good, I find that F-Secure software, the performance of the computer much less slows as I know it from other programs.
What I as a layman is not now able to assess 100%, whether the virus scanner also works reliably. So far I have the feeling that it is so.
At least we noticed nothing of malicious software.
The updates are downloaded and installed reliably.
I can only recommend F-Secure.