I do a fair amount of work with Win32::OLE and it's always a good idea to check errors after certain operations. Otherwise, debugging can be quite painful down the road, or if one OLE call dies and snowballs. I use an OLE error checking sub like so:

$obj=Win32::OLE->GetObject("IIS://localhost/W3SVC/1");
&OLEErrChk("Binding to W3SVC1",1)
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That way you can also trap common errors and act on them, also.

sub OLEErrChk {
  my $operation=shift;
  my $critical=shift;
  my $errnum=Win32::OLE->LastError;

  if(!$errnum) {
    if ($errnum=~/0x80070094/) {
      print "$operation Failed (in use) trying something..\n";
      &Something;
    }
    else {
      print "$operation Failed: $errnum\n"; 
      die if ($critical);
    }
  }
  else {print "$operation was Successful.\n"}
}
[download]

Hope that helps, Vlad