You enter into a remote session, you have no need to use Invoke-Command here, and this do not execute because of the double hop restriction. Despite you can add more code to allow it, this is not useful here.
Moreover, Enter-PSSession -ComputerName NESCH11 -Credential $cred will be running separately than the rest of the script. This mean that cd C:\ will be executed on your local machine - just like all other commands after it.
Use Invoke-Command instead:
Enable-PSRemoting -Force
$password = ConvertTo-SecureString "xxxxxxxxx" -AsPlainText -Force $username = "NE\a_chermes2" $Cred = New-Object System.Management.Automation.PSCredential ($username, $password)
Invoke-Command -ComputerName NESCH11 -Credential $cred -ScriptBlock {cd C:}
Of course, this will not do anything noticeable since all is done remotely and you only change the directory location. Try Get-ChildItem C: instead of cd C:. This syntax allow you to collect data remotely :
$dirList = Invoke-Command -ComputerName NESCH11 -Credential $cred -ScriptBlock {gci C:}