I'm wondering if you got the right binaries. I looked in my own installation of ActiveState Perl and I already had Tk installed, don't recall doing that - but I might have and forgotten about it, so if it isn't included by default, try starting the Perl Package Manager (PPM) and type:

install Tk
[download]

instead of installing manually. Always try PPM first when using ActiveState on Windows - it doesn't always work, the modules aren't always available (or the latest), but for the common modules it is often easiest. Then you get a version specifically targetted to your Perl, and the docs are updated automatically etc.

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You have moved into a dark place.
It is pitch black. You are likely to be eaten by a grue.