Register-NewEventWatchers.ps1

function Register-NewEventWatchers
{
    [CmdletBinding()]
    Param(
        [Parameter(Mandatory=$true)]
        [String]$CSVFolder
    )

    $logNames = (Get-EventLog -LogName *).Log

    foreach ($logName in $logNames)
    {
        $logName = $logName.Trim()
        $csvPath = [system.io.path]::Combine($CSVFolder, "$($logName).csv")

        $action = {
            Get-EventLog -LogName System -Newest 1 `
                | Export-Csv    -NoTypeInformation `
                                -Path "$csvPath" `
                                -Append 
        }

        Register-ObjectEvent -InputObject $log -EventName EntryWritten -Action $action

        $log = New-Object System.Diagnostics.EventLog -ArgumentList @("$logName")
        $handler = Register-ObjectEvent -InputObject $log -SourceIdentifier "$($logName)EntryWritten" -EventName EntryWritten -Action $action -ErrorAction SilentlyContinue
    }
}

function Unregister-NewEventWatchers
{
    $logNames = (Get-EventLog -LogName *).Log

    foreach ($logName in $logNames)
    {
        Unregister-Event -SourceIdentifier "$($logName)EntryWritten"
        Get-Job | Stop-Job -ErrorAction SilentlyContinue
        Get-Job | Remove-Job -ErrorAction SilentlyContinue
    }
}