cannt visit the neighbor

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There have a computer which cannt visit the neighbor. every time as I
want to visit the neighbor, there jump up a dilagbox says things like
"you didnnt have the right to visit the neighbor"

system: windows xp sp1
can visit the internet and can ping the other computer in the LAN.
there is no problem with workgroup and IP adress configration.(have
the same workgroup name, and IP adress is same with the other computer
in the LAN except the last unit. )
can visit the neighbor start the system in the safemodel.

what's wrong?

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