Help! Help has vanished!

My DOpus started to behave really strangely - so I un and reinstalled the latest x64 version. Tragically I am unable to restore any form of my backed up configuration styles (@!#@!$!@%!) and as many of the settings/buttons were put in place forever ago I have forgotten how I did them in the first place. Now Help won't work. The tool tip says "Displays online help" (??) but I get nothing with either the menu item or F1.

Any thoughts?? Probably something so simple I am going to cringe ... again.

javascript:emoticon(':oops:')

Sigh ... after many OTHER things went wrong, including Failed Backups and numerous other errors messages, I re-reinstalled, this time over the top of the existing installation (ie didn't uninstall first) and now all is well. Go figure!