Config.pm is the module that stores the configuration information for your version of Perl. Of course, the hardcoded version number there means that this version of Config.pm is for a Perl of that version, 5.12.3. So, your installation got corrupted and I recommend starting over fresh, or restoring that directory from a known good backup.
I am now going to get rid of all the vendor perl version and re-install Strawberry flavor.
On side note:
The posting editor forces you to learn some HTML tags rather than just plain posting. Not that I am complaining since just couple of them, completely UN-necessary though.