need help with home network

i need some help with my home net work on one computer.
heres the background: i have 3 computers at home two have XP and the other has vista. i can set up network between the vista pc and one of the XP PC's but i can't for this PC. When on the other PC's and looking at the network and can see this PC but i can't access it. Also on this PC when trying to set up network everything goes through fine but nothing shows up in my network places. i have done the exact same thing to what i have done on the other XP PC but i just can't seem to get it to work.
any surrgestions would be good

thank you
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More about need home network
  1. Disable any firewall programs you may have running.
  2. antivirus w/ a improperly configured firewall is the problem
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