Workgroup Accessibility

I have one computer tht cannot access our workgroup, and
visa versa. We can all see this computer as part of the
workgroup, but when trying to connect we get a message
that states "Windows could not start the computer browser
on Local Computer. For mor information, review the System
Event Log. If this is a non-Microsoft service, contact
the service vendor, and refer to service-specific error
code 2550".
Everyone is runnign XP Home edition. I have tried the fix
in the knowledge base which is turn on NetBIOS over
TCP/IP (did that)and start the Computer Browser Service
(will not start--this is when I get the above message).
Everyone else in the workgroup has the same settings, and
their browser service startup is set to automatic.
Any ideas why this one machine cannot be accessed?