Remove Old network connection Causing IP conflict with an other network connection

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Method 1
  1. Goto Command prompt using Run->CMD
  2. Type set devmgr_show_nonpresent_devices=1, and then press Enter.
  3. Type Start DEVMGMT.MSC, and then press Enter.
  4. Click View, and then click Show Hidden Devices.
  5. Expand the Network Adapters tree.
  6. Right-click the dimmed network adapter and then click Uninstall.
Method 2
The DevCon utility is a command prompt utility that acts as an alternative to Device Manager.
 Download the DevCon tool from Microsoft website
devcon listclass net

Run the following command to retrieve all network adapters:

devcon findall =net

For those network adapters that are not listed in the result of the first command, note the instance ID of those items, and then run the following command for each instance ID:

devcon -r remove<instance ID>
For example, run the following command:
 devcon -r remove “@PCIVEN_10B7&DEV_9200&SUBSYS_00D81028&REV_784&19FD8D60&0&58F0”

Method 3
  1. Start Registry Editor (REGEDT32.EXE) and locate the following registry subkeys in the HKEY_LOCAL_MACHINE subtree, where number is the number of any network adapter that appears in the Installed Adapter Cards section in the Network tool in Control Panel:
  1. Manually remove all subkeys pertaining to the network adapter.
  2. Quit Registry Editor.
  3. Shut down and restart Windows.

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