Yeah, I have Vista too and it won't open from there.
Try this instead: from the start button go to the OOTP folder, then the folder for your version you want to uninstall then the tools folder then try the unlicense shortcut there.
If that doesn't work, try this:
http://www.ootpdevelopments.com/boar...licencing.html
And if all else fails, contact elicense and ask them to unlicense it on their end.