mungooz
Could be a browsemaster issue, sme is usually the browsemaster.
Windows computers will act as browsemaster by automatic election, unless you have disabled the browsemaster function in the registry.
Search these forums on browsemaster as related to sme server (& Windows registry settings), and search google for more general info.
Alternatively it could be a DNS or WINS server issue, you probably need to specify the routers gateway IP in your Windows computers networking setup.
At a DOS prompt type
ipconfig
ipconfig /help