Can you open up the V7.5 Tune tool, then click Help->Register EFILive. If your registration details are not populated, then re-enter them (make sure you select the proper License type- unless you have a V1 Personal select Commercial Scan&Tune). There was a problem with an earlier installer erasing the files in the My Documents\EFILive\V7.5 folder so it might have deleted your license file.

BTW, there is a new public version released just an hour ago. Get it here: http://forum.efilive.com/showthread....-March-29-2012