Cmd and enter
The gateway, dns and wins should be your SBS
Ping ip of gateway or your SBS if the gateway is not the same as your WINS
If you can ping your server great.
If you have a Dell go to services
Make sure Network Location Awareness is set to automatic.
Go to your network properties.
click on Advanced
Make sure that your LAN is at the top.
You could reboot for th enla and nic stuff to stick. The cleared passwords problem should work right away. I also clear passwords in Internet Explorer. Tools/Internet Options/Content and Autocomplete.