Sounds like you messed things up when you upgraded from 5.12 to 5.14. Uninstall all the stuff that you have now. Clean out the Perl directories and delete them. You will have to find out in Windows 7 how to edit your path so that previous stuff is not there.

Go to ActiveState site and do a clean install of 5.14. I think that ActiveState still installs to the default directory of C:\Perl. I advise against changing it to "C:/Perl 5.14.1", which apparently you did? Use ppm to install Tk.

Do not use CPAN to try to install Tk! Always use ppm. The ActiveState version has been ported and is designed to work with Windows. There is nothing wrong with Tk - its old, but works fine (within limits!) and there are lots of examples out there.