As u need to kill the process if it hangs(meaning u need to control process), the process you create must be an asynchronous process.
The following is a code snipet of the same under windows

use strict;
use Win32::Process;
my ($processObj, $pid);
Win32::Process::Create($ProcessObj,
                  "C:\\foo\\Setup.exe", "Setup.exe", 0, 
                   NORMAL_PRIORITY_CLASS,".")|| die "$!\n";
$pid = $ProcessObj->GetProcessID();
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Using the pid you can control the process.
To kill the process say,

$ProcessObj->Kill($exitcode);
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Amar