Camera Setup Info not available

I’ve been using SGP with an Atik490EX Color successfully, but suddenly even though all my camera profile info is entered, when I check the “Atik Camera Setup” dialog box, the dropdown box is blank and instead I get an error message saying
Failed to show help file ASCOM.Atik.Camera.pdf, error:
System.ComponentModel.Win32Exception (0x80004005): The system cannot find the file specified…
(and then it lists several System.Diagnostics.Process items)

Should I simply uninstall and re-install everything and start from scratch? I hope not.

Maybe just uninstall and reinstall the Atik ASCOM driver for starters?

Thanks. Yes, I figure it will be a piece-by-piece process of elimination. A.P. is always an adventure.