Thanks Robin. It's now fixed.
I disabled PDF Architect 4 ActiveDoc Class from the Run Without Permission add-ons, but that didn't help. I then attempted to run the stand-alone installer, but it said the program was already installed.
I fixed the problem using the following steps:
- Using Glary Utilities Uninstall Manager, uninstall the 10 PDF Architect modules that it found.
- Install PDF Architect using the stand-alone installer.
- PDF Architect was now in the Uninstall a Program list, allowing me to deselect Internet Browsers Integration in the Setup Manager.
Thanks for your help, Robin.