If you want to install Perl on Windows or do anything vaguely sophisticated in the brain-dead command line shell of Windows (a.k.a. the DOS prompt), then you need a collection of commonly used UNIX utilities that can run under Windows.
I have put together such a collection of the most popular UNIX utilities and a few other command-line programs. Most of these are GPL-licensed (i.e. open source) and the remaining few are free-ware (but not open source). Either way, you can do with these programs whatever you want.
You can download the bundle of utilities from here
These utilities are particularly useful for installing Perl on your Windows PC. Download Perl for Windows from http://www.activeperl.com