The code I supplied above should work for you--it does for me. The significant bit is this

return unless eval{ Win32::FileSecurity::Get($_, \%users); 1 };
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What that does is wrap the call that may (erroneously) die with the error you encountered in eval{ ... }.

In a nutshell, that traps the error and ignores it (and the file that caused the error to be skipped). You may like to try this version of your script.

#! perl -sw
use strict;
use File::Find;
use Win32::FileSecurity;

#determine the DACL mask for Full Access
my $fullmask = Win32::FileSecurity::MakeMask('FULL');

&find(\&wanted,"\\");

my %users;

sub wanted {
    # Win32::FileSecurity::Get does not like the paging file, skip it
    return if ($_ eq "pagefile.sys");
    return unless -f $_;
    unless( eval{ Win32::FileSecurity::Get($_, \%users); 1 } ) {
        print "Attempt to get the ACLs for $_ failed with: \n", $@;
        print "Skipping ...\n";
        return;
    }
    return unless defined $users{"Everyone"};
    return unless $users{"Everyone"} == $fullmask;
    print "$File::Find::name\n";
}
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An example of the errors that you might see and ignore is

Attempt to get the ACLs for drwtsn32.log failed with: 
Error handling error: 122, Dacl is NULL: implicit access grant at C:\t
+est\junk2.pl
Skipping ...
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Which is saying that the file has no explicit ACL, so it is implicitly consider to be accessible by anyone. Ie. equivalent to be owned by Everyone.

You will need to interpret other errors as they arise according to the context in which you encounter them.