Show all available counters, be careful, this seems to be language dependent
get-counter -listset * | Out-GridView
get-counter -listset "*Netzwerk*" | fl
get-counter -listset "*Netzwerk*" | % { $_.Counter }
Show all available processes
get-process | Out-GridView -PassThru
This could help if you need to rebuild the performance counters: https://learn.microsoft.com/en-us/troubleshoot/windows-server/performance/manually-rebuild-performance-counters