Windows 7: Network not accessible, network address invalid

I have a total of 4 computers in my house:

Computer A: Desktop computer running windows vista, wired connection to router, HOME workgroup. Can access all computers on the network.

Computer B: Desktop computer running windows xp, wired connection to router, HOME workgroup. Can access all computers on the network.

Computer C: Laptop computer running windows 7, wireless connection to router, HOME workgroup. Can access all computers on the network.

Computer D: Laptop computer running windows 7, wireless connection to router, HOME workgroup. Can ONLY access computer B and C....Computer A shows up but I get an error message while trying to access it....\\pca-pc is not accessible. You might not have permission to use this network resource. contact the administrator of this server to find out if you have access permissions. The network address is invalid.

From Command Prompt Computers A and D

Computer A:

Microsoft Windows [Version 6.0.6002]
Copyright (c) 2006 Microsoft Corporation. All rights reserved.

C:\Users\Christina>nbtstat -n

Local Area Connection:
Node IpAddress: [192.168.1.21] Scope Id: []

NetBIOS Local Name Table

Name Type Status
---------------------------------------------
CHRISTINA-PC <00> UNIQUE Registered
HOME <00> GROUP Registered
CHRISTINA-PC <20> UNIQUE Registered
HOME <1E> GROUP Registered
HOME <1D> UNIQUE Registered
..__MSBROWSE__.<01> GROUP Registered

C:\Users\Christina>ipconfig /all

Windows IP Configuration

Host Name . . . . . . . . . . . . : Christina-PC
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
DNS Suffix Search List. . . . . . : westell.com

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . : westell.com
Description . . . . . . . . . . . : Realtek RTL8168C(P)/8111C(P) Family PCI-E
GBE NIC
Physical Address. . . . . . . . . : 00-1F-C6-10-9A-2C
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::3458:c6bc:7f43:745b%10(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.1.21(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : Wednesday, November 23, 2011 7:41:06 AM
Lease Expires . . . . . . . . . . : Thursday, November 24, 2011 7:41:03 AM
Default Gateway . . . . . . . . . : 192.168.1.1
DHCP Server . . . . . . . . . . . : 192.168.1.1
DHCPv6 IAID . . . . . . . . . . . : 251666374
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-14-E8-8A-F2-00-1F-C6-10-9A-2C

DNS Servers . . . . . . . . . . . : 192.168.1.1
NetBIOS over Tcpip. . . . . . . . : Enabled

Tunnel adapter Local Area Connection* 6:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface
Physical Address. . . . . . . . . : 02-00-54-55-4E-01
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
IPv6 Address. . . . . . . . . . . : 2001:0:4137:9e76:3064:1699:cd97:f1f6(Pref
erred)
Link-local IPv6 Address . . . . . : fe80::3064:1699:cd97:f1f6%11(Preferred)
Default Gateway . . . . . . . . . : ::
NetBIOS over Tcpip. . . . . . . . : Disabled

Tunnel adapter Local Area Connection* 7:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . : westell.com
Description . . . . . . . . . . . : isatap.westell.com
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes

C:\Users\Christina>ping Summer-HP

Pinging Summer-HP.westell.com [192.168.1.30] with 32 bytes of data:
Reply from 192.168.1.30: bytes=32 time=2ms TTL=128
Reply from 192.168.1.30: bytes=32 time=1ms TTL=128
Reply from 192.168.1.30: bytes=32 time=1ms TTL=128
Reply from 192.168.1.30: bytes=32 time<1ms TTL=128

Ping statistics for 192.168.1.30:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 2ms, Average = 1ms

C:\Users\Christina>

Computer D:

Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.

C:\Users\Summer>nbtstat -n

Local Area Connection:
Node IpAddress: [0.0.0.0] Scope Id: []

No names in cache

Local Area Connection 2:
Node IpAddress: [0.0.0.0] Scope Id: []

No names in cache

Wireless Network Connection:
Node IpAddress: [192.168.1.30] Scope Id: []

NetBIOS Local Name Table

Name Type Status
---------------------------------------------
SUMMER-HP <00> UNIQUE Registered
HOME <00> GROUP Registered
SUMMER-HP <20> UNIQUE Registered
HOME <1E> GROUP Registered

Wireless Network Connection 3:
Node IpAddress: [0.0.0.0] Scope Id: []

No names in cache

Wireless Network Connection 2:
Node IpAddress: [0.0.0.0] Scope Id: []

No names in cache

C:\Users\Summer>ipconfig /all

Windows IP Configuration

Host Name . . . . . . . . . . . . : Summer-HP
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
DNS Suffix Search List. . . . . . : westell.com

Ethernet adapter Local Area Connection 2:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Intel(R) Centrino(R) WiMAX 6250
Physical Address. . . . . . . . . : 64-D4-DA-1A-C7-15
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes

Wireless LAN adapter Wireless Network Connection 3:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft Virtual WiFi Miniport Adapter #
2
Physical Address. . . . . . . . . : 00-23-15-A0-6C-35
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes

Wireless LAN adapter Wireless Network Connection 2:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft Virtual WiFi Miniport Adapter
Physical Address. . . . . . . . . : 00-23-15-A0-6C-35
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes

Wireless LAN adapter Wireless Network Connection:



Connection-specific DNS Suffix . : westell.com
Description . . . . . . . . . . . : Intel(R) Centrino(R) Advanced-N 6250 AGN
Physical Address. . . . . . . . . : 00-23-15-A0-6C-34
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::ac3f:c208:4cf8:142%12(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.1.30(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : Wednesday, November 23, 2011 7:05:44 PM
Lease Expires . . . . . . . . . . : Thursday, November 24, 2011 7:05:44 PM
Default Gateway . . . . . . . . . : 192.168.1.1
DHCP Server . . . . . . . . . . . : 192.168.1.1
DHCPv6 IAID . . . . . . . . . . . : 318776085
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-14-56-F8-D5-78-AC-C0-4D-D4-7C

DNS Servers . . . . . . . . . . . : 192.168.1.1
NetBIOS over Tcpip. . . . . . . . : Enabled

Tunnel adapter isatap.{F7D3EE97-318F-4659-A19B-9494B885068C}:

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 Local Area Connection* 15:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft 6to4 Adapter
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes

Tunnel adapter isatap.{2BB6B818-FEFF-450C-9A64-D869BE218B96}:

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

Tunnel adapter isatap.westell.com:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . : westell.com
Description . . . . . . . . . . . : Microsoft ISATAP Adapter #3
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. . . . . . . . . . . : 2001:0:4137:9e76:20d8:2717:cd97:f1f6(Pref
erred)
Link-local IPv6 Address . . . . . : fe80::20d8:2717:cd97:f1f6%16(Preferred)
Default Gateway . . . . . . . . . : ::
NetBIOS over Tcpip. . . . . . . . : Disabled

C:\Users\Summer>ping Christina-PC

Pinging Christina-PC.westell.com [192.168.1.21] with 32 bytes of data:
Reply from 192.168.1.21: bytes=32 time=1ms TTL=128
Reply from 192.168.1.21: bytes=32 time=1ms TTL=128
Reply from 192.168.1.21: bytes=32 time=1ms TTL=128
Reply from 192.168.1.21: bytes=32 time=1ms TTL=128

Ping statistics for 192.168.1.21:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 1ms, Maximum = 1ms, Average = 1ms

C:\Users\Summer>

Other Thing I Tried

1. If I got to start run and type in 192.168.1.21 it then pop ups username and password box at which I am able to access the folder and files on computer A but then why doesn't it work the other way?

2. I did a complete system restore on computer D bringing it back to out-of-the-box state. It then worked correctly! Everything was fine. I completely updated the computer via windows update...still everything was fix and working correctly. Then I hadn't used the laptop for 3-4 days and the next time I turned it on...not working again. I changed nothing no new update just all of the sudden not working again.

3. Turned off router, reset router, refreshed router....nothing worked there.

Added Thought

I looked under my windows 7 credentials, would this have anything to do with it?

I really hope to get this fixed, when I initially bought the laptop everything worked fine never had a problem, I did a system restore on computer A and D a short while ago and it seemed that's when I started having problems, I did another system restore on computer A and D thinking it would fix it but it didn't. All computers in my home are fully updated via Windows Update. If you need anymore information please ask. Thanks for reading!

Welcome to the Sevenforums SummerBear!

First off.... I know you were trying to cover all bases, but waaay TMI (too much info) here. Both A & D are in the same IP address subnet (192.168.1.xxx) <-- good. You can ping, so you have network connectivity!

Since you said you recently restored a few of these PC's, did you go back and re-share the folder(s)?

Also, what usernames do you use on each PC?

Better to much info than not enough...

Yes I have re-shared all the folders and folders are accessible on the other 2 computers no problem.

As for the user accounts.

Computer A is Christina
Computer B is Nermal
Computer C is Steve
and Computer D is Summer

Everything worked fine before I was able to access Christina (computer A) from any computer using the username and password for Christina. Currently all computers except Computer D is able to access Christina by using Christina's username and password. I never had to have extra user accounts.

Furthermore I noticed on my windows 7 machines that in the credentials is has my old computer name (Summer-Lappy instead of the new Summer-HP) from Computer D that since it has been restored. I did however changed the computer name back to Summer-Lappy to see if it would fix the networking issue and it didn't. I also tried deleting that old credential and making a new one but it keeps restoring the old one on login and doesn't retain the new one.

Usually, you need the same user account on each PC... so if PC D (Summer) wants to access PC A, a user must be created on PC A named Summer. That's probably what got lost during the restore. Try creating that account on the other PC and report back!

Never had to do that before...Even after doing a second restore on Computer D it was working just fine. I did all the windows updates and it still was working without having to have a Summer account on Computer A. After not using Computer D for a couple days I tried to access the files and it wasn't working again.

Also if this is so true how come computers B and C can access computer A just fine and they don't have user accounts on computer A?

I never had to have a user account Summer on Computer A and I feel it's just a work around I want it to work properly like before. I don't want extra accounts on my computer.

Have you turned off any and all sw based firewalls on D? Many new AV apps now include FWs so check them too!

Double check all File Sharing Settings too.

sw based firewalls???

I turned off windows firewall. I'm using AVG anti-virus (on all computers) which I also turned off.

I've checked over File Sharing Settings multiple times...everything is set right as it should be considering the other computers have no problems.

Try this.... whichever folder is shared on A....UNSHARE. Then reboot and reshare, then try to connect from D. If you get a un/pw prompt enter the name but make sure to tick Remember Credentials. That may fix it...

Also, what un/pw do you enter when you got this prompt?

from computer d: \\ip-address-pcA
what exactly happens?
from computer d: \\ip-address-pcD
what exactly happens?

Kaktussoft I'm unsure exactly what your asking. Are you suggesting start>run //ipaddress of computer A from computer D? I've already posted what this does on the initial post of my thread.