That's quite normal. nothing to worry about.
This warning is currently benign and has been fixed for Bitcoin Core 0.18. You see it because miners are using the block version number for a mining optimization called ASICBOOST. However soft forks in the past have used the version number for readiness signalling. Bitcoin Core is seeing version numbers it is not expecting (due to ASICBOOST) and thus triggering the warning.
I don't see a 18.0 win86 version so i think you might be stuck with this warning. (or you need to build v18.0 yourself, but i'm not sure if that's possible either.)