flock works "fine" on Windows NT based Win32 operating systems, so it should be fine on NT4, 2K and XP. flock does not work on the 9x based Win32 operating systems, so this can't work on 95, 98 or Me. You don't say which flavour of Win32 you have, but I assume it's a 9x rather than an NT version.
The warnings are there to suggest that you are using something that you never initialised. Perl is just making a suggestion that as they contain nothing yet, this may not be what you want.
As you haven't loaded CGI::Carp your warnings are going to STDOUT, which is probaly what is upsetting the server. Try changing use CGI qw( fatalsToBrowser ); to use CGI::Carp qw( fatalsToBrowser );
While not critical if you serer isn't exposed on the Internet, it's probably best as december says to upgrade Apache when you get a chance.
UPDATE: Long paragraph broken in two to clarify statment.
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