Windows 7 Loses my Network and becomes an Unidentified Network on Reboot

Windows 7 Professional, wired network. Whenever there is a Windows upgrade that requires my computer to be rebooted, it loses my workgroup and internet connection and shows I have an "Unidentified Network" connection.  I cannot change it. I cannot delete it.  I cannot even set up a new network connection.  If I shut down the computer and restart it my old network settings are back and everything works fine.  My network card drivers (Intel 8256V-210/100) are up to date.  Any ideas? 
Answer
Answer
Hi Bill_PCTA,
Welcome to Microsoft Answers Forum.
Method I:
I suggest that you boot the computer in safe mode with networking and check if you are able to connect to the internet without any issues, safe mode starts Windows with a limited set of files and drivers. Startup programs do not run in safe mode, and only the basic drivers needed to start Windows are installed, follow the steps to boot the computer in safe mode with networking:
1.     Restart your computer if it is powered on.
2.     Tap the F8 key after your computer initially powers on.
3.     Once you see the Advanced Boot Options menu you can stop tapping.
4.     Use the up/down arrow keys to highlight your selection.
5.     Select Safe Mode with Networking and press Enter.
6.     You should see drivers loading, and then please wait.
7.     You should then be at the Welcome Screen.
8.     Logon to your computer using an account with Administrator privileges.
Start your computer in safe mode
http://windowshelp.microsoft.com/Windows/en-US/help/323ef48f-7b93-4079-a48a-5c58eec904a11033.mspx
If that works fine then we have to reduce the security settings, still if you have any problem please try method 2
Method 2:
Disable the IP Helper service:
1. Hold the Windows key and type R, enter "services.msc" (without the quotes) and press Enter
2. Scroll down to the IP Helper service, right click on it and select Properties
3. In the dropdown box that says "Automatic" or "Manual", set it to Disabled and then click on "Apply"
4. Then click on "Stop" to stop the service from running in the current session
5. Click OK to exit the dialog
 
Disable the DHCP Broadcast Flag:
Note: the article for vista\win7 remains same
Link: http://support.microsoft.com/default.aspx/kb/928233
Important: This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
http://support.microsoft.com/kb/322756.  How to back up and restore the registry in Windows
 
Windows7 cannot obtain an IP address from certain routers or from certain non-Microsoft DHCP servers
 
To resolve this issue, disable the DHCP BROADCAST flag in Windows7. To do this, follow these steps:
1. Click Start, type regedit in the Start Search box, and then click regedit in the Programs list.
2. If you are prompted for an administrator password or for confirmation, type your password, or click Continue.
3. Locate and then click the following registry subkey:
4. HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\{GUID}
5. In this registry path, click the (GUID) subkey that corresponds to the network adapter that is connected to the network.
6. On the Edit menu, point to New, and then click DWORD (32-bit) Value.
7. In the New Value #1 box, type DhcpConnEnableBcastFlagToggle, and then press ENTER.
8. Right-click DhcpConnEnableBcastFlagToggle, and then click Modify.
9. In the Value data box, type 1, and then click OK.
10. Close Registry Editor.
 
By setting this registry key to 1, Windows7 will first try to obtain an IP address by using the BROADCAST flag in DHCP Discover packets. If that fails, it will try to obtain an IP address without using the BROADCAST flag in DHCP Discover packets.
Method III:
1. Network connectivity fails when you try to use Windows Vista behind a firewall device
http://support.microsoft.com/kb/934430
2. Windows Vista cannot obtain an IP address from certain routers or from certain non-Microsoft DHCP servers
http://support.microsoft.com/kb/928233
3. Troubleshoot network connection problems
http://windows.microsoft.com/en-us/windows-vista/Troubleshoot-network-connection-problems
4. How to reset Internet Protocol (TCP/IP)
http://support.microsoft.com/kb/299357
Thanks & Regards,
Hope this helps. Let us know the results.
Vijay – Microsoft Support
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Last updated May 30, 2018 Views 16,169 Applies to: