Okay, here goes. Some  basic info: My wife and I have our COMPUTERS networked by Etherner cables through a Linksys WRT54G router. I am running Win XP Pro and my Wife is using Win 7 Home. I have a PCI network card and my wife has an onboard network adapter. Our printer is connected to my computer. We also shared an external HD, (NAS), but I will be replacing it with a new one. We also USE Networks Magic Essentials vs. 5.5.9195. We have had no problems until the past couple of months. The NAS software started indicating there was a network CONNECTION problem with my wife's computer. I also could not access her files on the NAS as I previously could. 

These are the weird problems I am having with my wife's Win 7 computer. The Event Mgr gives an WARNING every time the computer in started up, "Realtek PCIe GBE Family Controller is disconnected from network". When I check the map of the network it shows her computer, a big ?, the router and internet. At the bottom of the page there is an icon for my computer with it's name stating that it cannot be placed in the map.  The Device Manager shows the card is working and the drivers have been updated.

We can access each others files through Windows Explorer and Network Magic which I could live with, but I want to connect the new NAS and I want to resolve the network problem.   She also has no problems printing on the printer connected to my computer. I am at the brink of wiping the drive and reloading Windows, but only as a last resort.  I have posted the results of the ipconfig below, which is mostly Greek to me. Thought it my shed some light. I am welcoming all help I can get.  I appreciate everyone here and thank you in advance.

Thanks.
 
Windows IP Configuration

   Host Name . . . . . . . . . . . . : Char-PC
   Primary Dns Suffix  . . . . . . . :
   Node Type . . . . . . . . . . . . : Hybrid
   IP Routing Enabled. . . . . . . . : No
   WINS Proxy Enabled. . . . . . . . : No

Ethernet adapter Local Area Connection:

   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Realtek PCIe GBE Family Controller
   Physical Address. . . . . . . . . : 00-25-64-85-FF-69
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes
   Link-local IPv6 Address . . . . . : fe80::710f:92d3:a599:1899%10(Preferred)
   IPv4 Address. . . . . . . . . . . : 192.168.1.200(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Lease Obtained. . . . . . . . . . : Saturday, June 04, 2011 12:15:45 PM
   Lease Expires . . . . . . . . . . : Sunday, June 05, 2011 12:15:45 PM
   Default Gateway . . . . . . . . . : 192.168.1.1
   DHCP Server . . . . . . . . . . . : 192.168.1.1
   DHCPv6 IAID . . . . . . . . . . . : 234890596
   DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-13-EA-37-FA-00-25-64-85-FF-69
   DNS Servers . . . . . . . . . . . : 66.168.128.20
                                                 24.205.224.36                                       
                                                 68.190.192.35
   NetBIOS over Tcpip. . . . . . . . : Enabled

Tunnel adapter Local Area Connection* 9:

   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. . . . . . . . . . . : 2001:0:4137:9e76:1438:3491:b478:10e2(Preferred)
   Link-local IPv6 Address . . . . . : fe80::1438:3491:b478:10e2%12(Preferred)
   Default Gateway . . . . . . . . . : ::
   NetBIOS over Tcpip. . . . . . . . : Disabled

Tunnel adapter isatap.{B3C7153B-5EA3-44AC-8703-79C306AC3FF7}:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Microsoft ISATAP Adapter #2
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
From your post
Quote

external HD, (NAS)

Network-attached storage (NAS) is file-level computer data storage connected to a computer network providing data access to heterogeneous clients. As of 2010[update] NAS devices are gaining popularity, as a convenient method of sharing files among multiple computers.[1] Potential benefits of network-attached storage, compared to file servers, include faster data access, easier administration, and simple configuration.
http://en.wikipedia.org/wiki/Network-attached_storage