Put the following code snippet into the top of your bat file. PowerShell is required.

"%SYSTEMROOT%\system32\cacls.exe" "%SYSTEMROOT%\system32\config\system"
IF %ERRORLEVEL% NEQ 0 (
  powershell -Command "Start-Process -Verb RunAs -FilePath '%0' -ArgumentList '%*'"
  exit /b
)

In the sample bellow the PowerShell script will append a service into RemoteAccessCheckExemptionList in registry. It also checks whether the value already exists there or not.

$subkey = 'SYSTEM\CurrentControlSet\Control\SecurePipeServers\SCM'
$value  = 'RemoteAccessCheckExemptionList'

$reg = [Microsoft.Win32.RegistryKey]::OpenRemoteBaseKey('LocalMachine', $server)
$key = $reg.OpenSubKey($subkey, $true)
$list = $key.GetValue($value)

if ($list -notcontains 'MyServiceName') {
  $list += 'MyServiceName'
}

$key.SetValue($value, [string[]]$list, 'MultiString')

If you need to remove X days old folders from a command line here is a short PowerShell command which will take care of it.

PowerShell -Command "& Get-ChildItem "%1" | Where-Object {$_.PSIsContainer -and $_.LastWriteTime -le [System.DateTime]::Now.AddDays(-%2)} | Remove-Item -Recurse -Force"

Just replace %1 with a base folder and %2 with number of days.