$credential = Get-Credential

$Computers = Get-Content computers.txt

Foreach ($computer in $computers) {
$scriptblock = {
Invoke-Command -ComputerName $args[0] -ArgumentList $credential -ScriptBlock {
    Start-Process -Credential $using:credential -FilePath "\\networkpath\setup.exe" -ArgumentList "/q","/x","/L C:\windows\logs\Uninstall.txt"
    Start-Process -Credential $using:credential -FilePath "\\networkpath\setup.exe" -ArgumentList "/q","/L C:\windows\logs\Install.txt"
}
}
Start-Job -ScriptBlock $scriptblock -ArgumentList $computer, $credential
}