[Kazun]

1) Для поиска в AD.

Код:

$ou = [ADSI]"LDAP://CN=Computers,DC=contoso,DC=com"
$proc = "calc.exe"

foreach ($child in $ou.children | ? {$_.objectCategory -match "Computer" -and $_.operatingSystem -notmatch "Server"})
{
	$child | ? {Test-Connection $_.dNSHostName -Count 1 -Quiet } | % {
		gwmi "Win32_Process" -filter "Name='$proc'" -ComputerName $_.dNSHostName | %{$_.Terminate()} 
	}
}

2) Если из файла .
gwmi "Win32_Process" -filter "Name='$proc'" -ComputerName (gc computers.txt) | %{$_.Terminate()}