Help file won't open in PB 12.5 & 12.6

I'm running Windows 7 and using PB 12.5.2 & 12.6.  When I try to open the Help file, the cursor spins for a second, and then nothing happens.  (Yes, I have the Windows Help program (WinHlp32.exe) for Windows 7 installed).

Any ideas on how I can fix this?  Thanks.