Shared drives on network issue

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http://serverfault.com – I have over 6 computers that are not listed on a domain, just normal local logins. There is one computer which is called User-PC which has a RAID Array. We also have another computer called TV-PC which runs Media Center and records our tv. Both of these computers have shared folders. From 5 out of 6 computers I can access the drives though from my laptop running over Wifi (Matts-Computer) I can't access any other device on the network. I have other computers running on the network that share and access shared folders fine. I have a shared drive on the laptop and everyone on the drive can acces (HowTos)