How to Resolve - 1 XP PC not showing in My Network Places and Networks in Windows 7?

1 XP PC not showing in My Network Places and Networks in Windows 7

I have 3 pcs: Blackbox(XP Home),Winbox(XP Home),Laptop(Windows 7).
Blackbox can browse winbox and Laptop.Blackbox "sees" both computers in "My Network Places."
Winbox can browse "Blackbox" and "Laptop."Winbox "sees" both in MY Network Places.
Laptop can browse "Blackbox" and "Winbox."Laptop "sees" Winbox in "Networks."
 
The problem:
Blackbox doesn't show up in Winbox's MY Network Places,or Laptop's Networks(yet it's browseable from all computers!)
 
Am I lucky,or what?
 
All computers network through a Linksys BEFRS41 wired router using DHCP.
TCPIP over Netbios is turned on.
Computer Browser Service is on
Ipconfig /all reveals no problems.
Disabling Firewall (Sunbelt Personal Firewall ) didn't help
 
Why might Blackbox not be showing up,yet I can access it fine from Winbox and Laptop?
 
Richard A+ MCP Win 2k Pro

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