192.168.4.100 is a local network address.. are you in shared accommodation?
Nope. Useless software. Pay no attention to it.
I see around 2-300 port scans a day, so nothing to worry about.
The software blocked it - it did it's job forget it and move on.
How is a port scan even getting to your PC when you're on a private network? Are you using static NAT or in the DMZ?