Replacing Key in TurboFloat Server

I accidentally deleted the license key I had attached to my TurboFloat Server. I created a new one to use, but when I try to add it, I get a "You can only run one instance of this floating license server at a time" error. How do I replace the license that's in memory? I've tried replacing the files in the TurboFloat Server folder, re-installing the server. It seems to retain that old key in memory. Please help.

-Jason