When you get into the error condition, please open a command prompt and post the output from the following commands.
NBTSTAT -n
IPCONFIG /ALL
Hi, Here's mine, Ive been waiting for the original poster to reply first, but here tis  
Microsoft Windows [Version 6.1.7600]
Copyright (c) 2009 Microsoft Corporation.  All rights reserved.
C:\Users\John>nbtstat -n
Local Area Connection 2:
Node IpAddress: [192.168.0.101] Scope Id: []
                NetBIOS Local Name Table
       Name               Type         Status
    ---------------------------------------------
    WIN7I7         <00>  UNIQUE      Registered
    MSHOME         <00>  GROUP       Registered
    WIN7I7         <20>  UNIQUE      Registered
    MSHOME         <1E>  GROUP       Registered
Local Area Connection:
Node IpAddress: [0.0.0.0] Scope Id: []
    No names in cache
C:\Users\John>
--
---------------------------------------------------------------------------------------------------------------------------
Microsoft Windows [Version 6.1.7600]
Copyright (c) 2009 Microsoft Corporation.  All rights reserved.
C:\Users\John>ipconfig /all
Windows IP Configuration
   Host Name . . . . . . . . . . . . : win7i7
   Primary Dns Suffix  . . . . . . . :
   Node Type . . . . . . . . . . . . : Hybrid
   IP Routing Enabled. . . . . . . . : No
   WINS Proxy Enabled. . . . . . . . : No
   DNS Suffix Search List. . . . . . : optusnet.com.au
Ethernet adapter Local Area Connection 2:
   Connection-specific DNS Suffix  . : optusnet.com.au
   Description . . . . . . . . . . . : Realtek PCIe GBE Family Controller #2
   Physical Address. . . . . . . . . : 00-24-1D-CF-CF-F6
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes
   Link-local IPv6 Address . . . . . : fe80::e1da:f3e1:8a9e:3586%12(Preferred)
   IPv4 Address. . . . . . . . . . . : 192.168.0.101(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Lease Obtained. . . . . . . . . . : Saturday, 3 July 2010 8:55:48 AM
   Lease Expires . . . . . . . . . . : Saturday, 10 July 2010 8:55:48 AM
   Default Gateway . . . . . . . . . : 192.168.0.1
   DHCP Server . . . . . . . . . . . : 192.168.0.1
   DHCPv6 IAID . . . . . . . . . . . : 301999133
   DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-12-DE-E3-8A-00-24-1D-CF-CF-E6
   DNS Servers . . . . . . . . . . . : 192.168.0.1
   NetBIOS over Tcpip. . . . . . . . : Enabled
Ethernet adapter Local Area Connection:
   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Realtek PCIe GBE Family Controller
   Physical Address. . . . . . . . . : 00-24-1D-CF-CF-E6
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes
Tunnel adapter isatap.{B645A504-6691-49D0-9A17-86F82C8AE05F}:
   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Microsoft ISATAP Adapter
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
Tunnel adapter isatap.optusnet.com.au:
   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . : optusnet.com.au
   Description . . . . . . . . . . . : Microsoft ISATAP Adapter #2
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
Tunnel adapter Teredo Tunneling Pseudo-Interface:
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
   IPv6 Address. . . . . . . . . . . : 2001:0:cf2e:3096:1092:1a49:8595:593c(Pref
erred)
   Link-local IPv6 Address . . . . . : fe80::1092:1a49:8595:593c%13(Preferred)
   Default Gateway . . . . . . . . . : ::
   NetBIOS over Tcpip. . . . . . . . : Disabled
C:\Users\John>