I decided my reply was incomplete, given the exact question you had. Here's some code that does it.

use File::Find;
use strict;
our $belowpath = "common files";
our %found_dirs;

find( \&foobar,
      'c:/program files');

sub foobar {
    if ( $File::Find::dir =~ /$belowpath$/i
         && -d $_ ) {
             my $found = "$File::Find::dir/$_";
             $found =~ tr/\//\\/;
             print "$found\n";
         }
}
[download]

This prints:

c:\program files\Common Files\Network Associates
c:\program files\Common Files\Adobe
c:\program files\Common Files\InstallShield
c:\program files\Common Files\Symantec Shared
c:\program files\Common Files\Services
c:\program files\Common Files\System
c:\program files\Common Files\ODBC
c:\program files\Common Files\Microsoft Shared
[download]