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Windows 7 Ultimate Edition (64bits) IP Conflict error when None existed

Both of our windows 7 users are unable to grab an IP address from server 2003. These two windows 7 clients have been working fine for 6 months and suddently it doesn't work anymore today. I have tried system restore that didn't help either. The error I am seeing on the windows 2003 DHCP Bad address. I have also tried assigning an static IP to the windows 7 clients but still no connectivity. No pinging reply. Please help!
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3Musketeers
Asked:
3Musketeers
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1 Solution
 
Hypercat (Deb)Commented:
Have you checked to be sure this is not a hardware problem rather than software? Are both of these machines on the same switch or network connection? Have you checked cables, NIC card drivers, etc.?  If assigning a static IP address doesn't solve the problem, then it seems likely that there's some kind of physical connectivity issue between these two workstations and the server.
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3MusketeersAuthor Commented:
I am thinking of it's the Windows 7 issue... I updated the NIC driver that didn't solve the problem. Purchased brand new USB to NIC same issue.....I have also removed the regedit keys for the NIC cards and still doesn't work
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Adapters\<Adapter>

Also tried putting on different switches no luck.........Any more suggestions?
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msincorpCommented:
You might want to try rolling back the network card drivers.  I've had the same problem with Intel network cards where an automatic update was applied and 2 days later (the lease time out period for our dhcp server) they could no longer get on the network.

We rolled them back and presto.. back in business.

Hope this helps.

msincorp
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3MusketeersAuthor Commented:
also Windows XP users are working fine plugin on the same switch....
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3MusketeersAuthor Commented:
There is no rolling back driver, as it's the driver that comes with the window...I tried the new version as well.
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msincorpCommented:
Have you tried disabling IPV6?
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3MusketeersAuthor Commented:
IPV6 Disabled
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msincorpCommented:
Is it possible that the windows firewall is preventing the pc from getting an ip address?  Can you disable the service and restart the machine to see if gets an address?
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3MusketeersAuthor Commented:
It's not the firewall, I have confirm this by connect the PC directly to another wireless router, having the wireless router act as DHCP, and the clients computer pick up fine.... so the problem lays between windows 2003 and windows 7........I have also reformat one of the windows 7 client and same thing happens so it's not an update that causing it....
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msincorpCommented:
I was actually thinking the client firewall on the windows 7 box.  Possibly the built in fireall, or the firewall that comes in your antivirus suite, not the corporate firewall.
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3MusketeersAuthor Commented:
It's not the windows firewall or antivirus firewall because I have re-format one of the computer and still having the same issue without those software firewall turn on.
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Hypercat (Deb)Commented:
With the computer connected to the network and rebooted (so that it doesn't have an old IP address from the wireless network), could you please run an ipconfig /all post the results?
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3MusketeersAuthor Commented:
This screenshot is taken when I assigned an static IP to the computer
ipconfigall.png
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3MusketeersAuthor Commented:
I wonder why I am getting the Autoconfiguration IPV4 Address: 169.254.166.22
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3MusketeersAuthor Commented:
Got the Solution! For future people that ran into the same problem here is the solution:
add this key:
HKey_Local_Machine\System\CurrentControlSet\Servic es\Tcpip

Highlight the Parameters folder and add a new Key.
The key has to be DWORD, name the Key ARPRetryCount, and set the value to 0.
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Hypercat (Deb)Commented:
Were you able to figure out why that regkey wasn't there already?  Just curious. And can you post the source where you found the answer?  That info would be helpful for someone who searches EE for an answer to the same problem in the future.

Thanks!
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3MusketeersAuthor Commented:
Got this Solution from Microsoft Rep.
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