Contacting Tech support for a licensing issue will not get you anywhere.
For Photoshop if you click the Help Menu, you will see an option to De-Activate .... You'll then have the option to suspend the activation for the particular machine you are on, or deactivate it permanently
Lightroom does not have this feature, and currently doesn't track how many machines it's been installed on. In addition your LR license can be used on either Mac or PC
John, thanks for the reply.
I'm probably worrying over nothing, and the licenses I have is just that, and should work just fine. In CS5 and CS6 I will make sure I'm on line, and just do as you as and say and deactivate it permanently, then reinstall the OS and put everything back.