I have the same problem. PDF Creator Version 1.5.0 was working fine. I upgraded to version 1.5.1 and now PDF Creator doesn’t appear in the printer dialog list. I uninstalled and re-installed Version 1.5.1 and the same problem still exists. I got an error message during the installation of 1.5.1 - something about unable to install printer. I can’t provide the error log because there was also a problem with the error log. I’m running Windows XP.
I also had this problem after updating to Version 1.5.1 on Windows XP.
A Workaround to solve the issue was:
1. Deinstall PDF Creator (you may keep the settings)
2. Restart Windows XP
3. Reinstall PDF Creator.
Thanks jd. I followed your suggestion and it fixed the problem.