A loopback adapter is just a connection that never leaves the machine through the network stack. Some application may have installed it.
Open a powershell prompt and run the following
Get-NetAdapter | Out-File -FilePath "$($env:USERPROFILE)\Desktop\net.txt" -Append -Encoding ascii
Get-NetTcpConnection | Out-File -FilePath "$($env:USERPROFILE)\Desktop\net.txt" -Append -Encoding ascii
Get-Package | Out-File -FilePath "$($env:USERPROFILE)\Desktop\net.txt" -Append -Encoding ascii
If the last command doesn't work you can run this one instead
Get-WmiObject Win32_Product | Out-File -FilePath "$($env:USERPROFILE)\Desktop\net.txt" -Append -Encoding ascii
Upload the net.txt file from your desktop