RAS on WinXP Pro

[anvil]

I´m trying to set up an incoming connection to my WinXP Pro machine, but the wizard keeps telling me that the Routing and Remote Access service can´t be started. The event viewer has the following to say about it:
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<BR>The Routing and Remote Access service depends on the NetBIOSGroup group and no member of this group started.
<BR>For more information, see Help and Support Center at <!-- BBCode auto-link start --><a href="http://go.microsoft.com/fwlink/events.asp." target="_blank">http://go.microsoft.com/fwlink/events.asp.</a><!-- BBCode auto-link end -->
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<BR>I follow that link and get:
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<BR>Explanation
<BR>None of the services in the specified group started. Because the service is dependent on other members of the group, the service did not start.
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<BR>User Action
<BR>Ask the person with administrative rights on your computer to check the Event Log with Event Viewer to locate any service-related errors that could have caused this error. Your administrator should also check your computer´s configuration.
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<BR>Faaark! Help me please. Why am I missing the NetBIOSGroup group of services? I don´t see anything like that in the list of local services on my machine. I´ve had a look at the optional networking components that may not have been included in the original installation, but none of it looks promising.
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<BR>TechNet was no great help either.