you can do it with one timer just fine.
Code:

DIM $Computers
$Computers = 'NL-KDKF7PM','NL-TKDBYB1L'
$Timer = $Form.Timer(5000) 
For $count=0 to ubound($Computers)
 $Timer.onTimer = $Timer.onTimer + 
  'If Ping(' + $Computers[$count] + ')
   $CheckPCk' + ($count+1) + '.Checked = "True"
  Else
   $CheckPCk' + ($count+1) + '.Checked = "False"
  EndIf'
Next


having the timer loop twice every second is way too quick, so I reduced it back to 5s.
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