Hi there, 1. Do you have any other Adobe Product installed in your machine, if yes, are you able to use them? 2. PLease take backup of registry before you rename the folder from Registry Select HKey Current User and Hkey Local Machine, under Software>Adobe> "Robohelp Html" Rename all Robohelp folder.(Please make sure just rename it.) try launch the product if that doesn't work and try to install it on a new user account. Also if possible try and install with the new copy of Robohelp from Adobe.com Please let me know if that helps. Regards Priyank
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