Make sure you do not have any version of Perl already installed.
If you do, uninstall it through the Windows control panel
"add/remove programs"; if you still have a C:\Strawberry folder
rename or delete it.
Download and install
Strawberry Perl. You also get many other useful CPAN modules as well).
Log out and back in (or reboot)
Go to your start menu, then click the "Perl command" link
To confirm the installation worked type:
perl -v
Explanation of this setup
Strawberry Perl (a Perl packaged for Windows)
is recommended as you get many useful modules (especially those that are
tricky to install) along with it.
To interact with the command line and run Perl commands, you need to
run 'cmd'. There are better alternatives available as
well.