I re-registered hhctrl.ocx and then found that hh.exe was missing from the Windows folder.
Found some issues after running sfc /scannow. Hoping a reboot does the trick.
most likely it's this problem:
http://www.west-wind.com/weblog/posts/2012/Jan/11/Problems-with-opening-CHM-Help-files-from-Network-or-Internet
If not the same documentation is available online:
http://www.west-wind.com/webconnection/docs/
+++ Rick ---
I had an issue a few weeks ago where WinInit.dll was clobbered. Browsers would not work as a result. I have since addressed that issue by restoring a version of the DLL. However, when i view the contents of CHM files (such as those generated using West-Wind's help builder), the "content pane" on the right side of the helpfile will not display content. The navigable left side works and shows the tree index, but nothing on the right. Have also found that VFP forms with the OIE browser object used to display and edit html files will not display the content. I have tried a windows update but no joy. Any ideas?