"I don't work on it much, but it does work - although VERY slowly! If you can see any reason why it runs slow for me, let me know and I'll change it."

Ok I see you are running a perl module interface to clamav

use Mail::ClamAV qw/:all/;
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I'm talking about running the clamscan program itself directly:

my $results = `clamscan $dir`;
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or something using Tk::Fileevent like:

my $dir = "/var/spool/mail";
my $program = "/usr/local/bin/clamscan  $dir";
open(SCAN, "$program  2>&1 |") or die "Can't open: $!";
$mw->fileevent(\*SCAN, 'readable', [\&fill_text_widget,$t]);
MainLoop;

sub fill_text_widget {
          my($widget) = @_;

          $_ = <SCAN>;

          $widget->insert('end', $_);
          $widget->yview('end');

}
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Its almost always faster to run properly designed c programs when doing alot of file access and reading, so let clamscan do it.