LWP::Simple is about the easiest way, although you forego fine-grained error checking. The basic recipe goes like this:

use strict;
use warnings;
use LWP::Simple;

my $local = time . ".txt";
my $url = "http://www.example.com/";

my $page = get($url) or die "failed!\n";

open my $out, '>', $local or die "Cannot open $local for output: $!\n"
+;
print $out $page;
close $out;
[download]

You can then wrap that up in a cmd file:

@echo off
c:
cd \path\to\program\dir
perl get-page.pl
[download]

And run that as a scheduled task. Make sure the scheduled task service is enabled and running. You might want to think of a better name for your local file.