1) Start->Settings->Control Panel
2) Administrative Tools
3) Component Services
4) Services (Local)
5) Right click on "Messenger" select "Stop"
6) Right click on "Messenger" select "properties"
7) For "Startup Type" select "Manual"
Use add/remove programs > windows setup and remove winpopup from 'accessories'
Add/remove programs > windows setup and remove winpopup from system tools.
Also block NetBIOS ports 135, 137, 138. and 139 with your firewall.
you can also disable netbios
In order to check if you have NetBIOS installed over TCP/IP in your Win9x
system, look up its properties in (Start -> Configuration -> Control Panel
-> Network -> TCP/IP -> Properties -> NetBIOS tab), where there is a check
box that allowsyou to disable it.