Re: TCP/IP error message.
The registry can be accessed by going to Start, Run and type in Regedit.
Your registry keys are listed similar to the way your files are folders are listed in explorer. Before deleting any registry keys, you can export them by right clicking on a key and go to Export. The purpose of exporting registry keys before deleting them is so that if anything goes wrong or you delete the wrong registry key by mistake, at least you have a fighting chance of getting your PC back up an running again after.
For the first part, it's probably easier to search for the Local Area Connection as the key names and SSID's vary between each PC. Go to Edit, Find, and type in Local Area Connection. In the right pane, you will see Name=Local Area Connection. On the left hand pane you will see an open folder called Connection. It's the parent of that folder {SSID} you will need to export and then delete. An SSID is an unique identifier you will see in many registry folders an will normally contain {8-4-4-4-12} digits.
^ You will need to do this a couple of times to make sure there are no keys left to delete. Each of them should have a {SSID}/Connection folder. If your unsure about any, let me know.
Next, it's time to remove your current IP address from your Local Area Connection 2, and leave it as DHCP. This will help to identify the next registry key.
Back to the Registry, navigate to the key: HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Services
You will see most likely two below .NET if you have this installed, two {SSID}'s. Go into this folder, Parameters/tcpip and on the right hand pane you will see "IPAddress". If it still has the IP Address that your trying to use, this will be the one to delete. Again the folder to export and delete will be the top level {SSID} folder.
Go back to the key: HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Services
and look for Tcpip. Under this folder, look for Parameters, Interfaces. Look again within the {SSID} folders for "IPAddress" to see if it contains the IP address you want to use. Export and delete the {SSID} folder.
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