So you want to check all registry value for the correct data?
Code:

$key='HKEY_CURRENT_USER\Software\Meditech\Wrkstn\INIPTPDRIVER'
$values=arrayenumvalue($key) ;UDF
for each $value in $values
  $data=readvalue($key,$value)
  if left($data,7)='HPLaser'
    $rc=writevalue($key,$value,'PPII','REG_SZ')
  endif
next
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There are two types of vessels, submarines and targets.