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Microsoft Windows Vista will not DHCP

When using Windows Vista, the computer may not obtain an IP Address using DHCP.  This issue only occurs with Windows Vista in specific environments with Modems/Routers which do not support the DHCP Broadcast Flag.  There are two methods to resolve this issue.  The first option is to disable User Account Control.  The second option is to perform the following:
  1. Click Start - Run.

  2. Type: regedit

  3. Hit Enter.

  4. Locate and then click the following registry subkey:

    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\{GUID}

    In this registry path, click the (GUID) subkey that corresponds to the network adapter that is connected to the network.

  5. On the Edit menu, point to New, and then click DWORD (32-bit) Value.

  6. In the New Value #1 box, type DhcpConnEnableBcastFlagToggle, and then press ENTER.

  7. Right-click DhcpConnEnableBcastFlagToggle, and then click Modify.

  8. In the Value data box, type 1, and then click OK.

  9. Close Registry Editor.

  10. Reboot. 
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