You can report False Positives to F-Secure here:
https://analysis.f-secure.com/portal/login.htmlUntil they fix their database, you can exclude Media Center from their scans using these instructions:
https://community.f-secure.com/t5/Security-for-PC/How-can-I-exclude-an-application/ta-p/15400If it is throwing up the error when you are installing MC, and preventing you from installing it, you'd need to exclude the installer executable (and not MC itself). If it is throwing up the error after MC is installed, when you are trying to use it (or just on its own when it runs a background scan) then you need to exclude whatever it is tripping up over.
While you are at it, though, you may want to read through the this article and look at the
Taming Your Anti-Virus examples provided for Windows Defender or Symantec Endpoint Protection:
http://wiki.jriver.com/index.php/Troubleshooting_Security_SoftwareYou can probably improve the performance of Media Center by following some of those tips. In particular, excluding MC's running processes and your Library disk location can make substantial improvements in responsiveness. There's no article there specifically for F-Secure, but using the instructions from them linked above and referring to the other examples should get you through.
If you're having no other issues this isn't required, but if you feel like MC is slow in a few places, the issue very well might be F-Secure interfering. This isn't necessarily anything bad about F-Secure, by the way. That's just part of the deal. The way AV applications work is by intercepting all disk accesses (and often memory accesses too) and re-routing them through themselves. This
necessarily causes a loss of performance by its very nature (there is more work to do on every disk and memory access). It can also introduce bugs or other unexpected behaviors, because they are changing the way the OS works at a fundamental level and routing
everything through their own code.