The only thing I can suggest is to uninstall then reinstall or run a REPAIR from the Windows Control Panel Add/Remove programs area. You can do so by beginning the uninstall process for Logbook Pro but choose REPAIR instead of REMOVE. Other than that you may want to run the manual register bat file but I have no idea why this isn't working on your computer.
Computers with all the updates going on (Windows Update), anti-virus, spyware, security, firewalls just makes these things impossible to detect. No two computers are alike these days and it's really becoming up to the computer 'pilot' to figure out Windows unfortunately! It's a sad situation and probably why MAC is coming back to life, but this is the age of computers we have to live with today. The next version of Logbook Pro will not have these issues as it will run in a more isolated environment and not be affected by the issues we have at hand today.