You probably don't really even need NetBios running to do your average home networking.
If you or your roomie want to test your safety, go to
https://grc.com/x/ne.dll?bh0bkyd2 , the home of Shields Up!
It will scan your IP, and report what it finds. There are some port-specific tests you can run as well to see if you need to further stealth any ports on your machine that might be open for one thing or another. It will even offer advice as to how to easily remedy some of the more common exposures you might be experiencing.