Stopping NetBIOS Spam?

MoonFacedAssassin asks: "I woke up this morning to find that my computer had a Windows messaging pop-up window with an advertisement about getting diplomas and degrees. I was quite shocked to find that my Bellsouth DSL IP address had been spammed. Has this happened to anyone else? Other than closing off the port which this can come through, are there any other ways to block this spam? And, how responsible is Bellsouth (or any ISP for that matter) in handling issues like this?"

Dear Slashdot,

[crapulent]

Dear Slashdot,

When I go to work, I leave my front door unlocked and slightly ajar. The other day when I got back, I found vagrants sleeping on my sofa and defecating in my sink. Other than closing and locking my door when I leave, how can I get rid of them? Has this ever happened to you? Also, can I sue my landlord over this? Thanks.

Yours,
Confused in Cleveland

Re:You said it yourself...

[Basje]

Many of these probes are probably open windows machines on your subnet. Note their IP, and from within run or a commandbox on windows type:
net send ipnumber "your message"

It's implemented in samba too. Eiter in smbsend or smbclient. Look it up if you need it.

Re:FORMAT YOUR HARD DRIVE and reinstall.

[Anonymous Coward]

Thank you Steve Gibson.

Re:um.

[GalionTheElf]

since internet is a jungle now, do we want to see some new kind of ISP that babysits theyr not-so-technical users?

What, they don't have AOL where you're from? ^_^