Switch101,

    As a side note some of the ports you listed where NetBIOS/MS ports and NetBIOS should never be routed over the internet as its supposed to be used on the local LAN only. I would recommend having a small home/Office firewall on you internet facing line to keep alot of un-needed scans and traffic hitting you PC. Just cause you do not have personal data on the PC its your responsibility as the PC's owner to keep the device safe and prevent it from becoming a zombie or hosting illegal content. If you want to play and learn run Ethereal/Wireshark on the PC and review you logs. There are tons of places online and here on the forum to learn how to use Ethereal/Wireshark.

just my 2 cents add...

Brian