from Router log.
So if I understand correctly, you've a Windows 7 machine that is connected to a router/modem, which is connected to the Internet.
Your Windows 7 machine has a private IP address, and your router obtains a public IP address from your ISP (NAT setup).
The port scans you are seeing, are on the public IP address of your router.
If my description of your setup is correct, then seeing a lot of port scans on your router is, unfortunately, normal (unless your ISP takes some measures to protect your router).
There is a lot of port scanning on the Internet, both by humans and by infected machines looking for new targets.
If your router is properly configured and is not vulnerable (e.g. because you applied the latest firmware), then you should not worry.