How to install 64-bit after having installed 32-bit on Win7

Sep 26, 2012
I didn't realize there was a 64-bit version available. I've already spent a lot of time and energy setting up and configuring my 32-bit TCMD installation. I'd like to install the 64-bit, have it "take over" all the settings and configs I have so diligently spent hours on.

How do I do that?