Hi, first use the CODE tag like this:

<code>
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to enclose your source code.

I would recommend you type

perldoc perlfunc
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and read the docs on system. But in your case:

#!/usr/bin/perl

use strict;

my @args = ('C:\\WINDOWS\\System\\deltree.exe', '/y');
system @args == 0 or die "error: $!";
[download]

should work.