Access Denied in Peer to Peer Network

I have 6 computers using Windows XP Pro, and they are connected together with 10/100 Ethernet Switches using peer to peer network. One of the computer has 200GB hard drive added to as secondary drive.

Now none of the other computer cannot access to one computer with 200GB hard drive. The error message said Acess denied due not enough storge space on the server.

What can I need to do to fix this problem?