Leverages PSexec to execute winrm quickconfig on machines that don't have WSMan enabled for remoting

Enable-WSManRemote

function Enable-WSManRemote
{
    [cmdletbinding()]

    Param(
        [Parameter(Position = 0,
            ValueFromPipeline = $True,
            ValueFromPipelineByPropertyName = $True)]
        [ValidateNotNullorEmpty()]
        [string[]]
        $Computername
    )

    process
    {
        & 'C:\Program Files\SysInternals\PsExec.exe' "\\$Computername" -s winrm.cmd quickconfig -q
    }
}