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This will stop the NetBIOS interface but also stops Filesharing over NetBIOS (Port 135,139 and NetBIOS over TCP/IP Port 445)
If you want still to have the ability to get Files but not to share just uninstall the "Datei- und Druckerfreigabe fr Microsoft Netzwerke" in your Network-Adapter-Proterties. In english it should sound like "Data- and Printingservice for Microsoft Networks".
But don't forget that you still need the "Client for Microsoft Networks" to have the ability to get Files via NetBIOS! At all i would suggest you to use a central FTP and Link everybody with his Account so he could access files via the Explorer. ;)
For further readings i suggest you to read the two following articles which should exactly match your questions:
Windows Filesharing: Facing the Mystery
What's Port 445 used for win W2k/XP?
PS: THX i am a member! Will try to behave like one! :D