VNC error : unreachable host. (10065)

I am trying to access my laptop from a remote PC

I have VNC server installed on laptop..running win XP

I have VNC viewer installed on remote PC (its also XP)
wen i type in viewer address like "10.x.xxx.xx" it says

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VNC Viewer : Error
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unable to connect to host: A socket operation was attempted to an unreachable host. (10065)
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OK
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Please help