Network PC's 2/ 3 see PC1, PC1 cannot see PC2,PC3

  compumac 08:40 11 Mar 2009

I have 3 PC’s networked through a router. All able to access the Internet. Both PC2 and PC3 can see PC1 in Windows Explorer and files can be moved between all three.
PC 1 cannot see the other two in Windows Explorer but by using Windows Search Companion and look for computers, PC 1 can see the other two and I have subsequently therefore created short cuts on the desktop of PC1 to access 2 & 3.
The system has been fine for a very long time and only displayed the problem recently.
The question is – Why cannot Windows Explorer see PC2 & PC3?

  compumac 08:43 11 Mar 2009

Should add - XP Home on all PC's, BTHub. All connected by cable.

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