Go to C:/program files(x86)/Adobe/Adobe Help ,
move this folder on the desktop ,
run the installation again for the software, once installation gets complete, check the adobe help is working fine.
Hope this isn't too late for you, but I had the same problem and have found a solution.
The hang also happens with Creative Cloud installs, and with both InDesign and Illustrator. It is a known issue with the Adobe Help installer (Mentioned here in an enterprise deployment context: http://blogs.adobe.com/oobe/2010/07/adobe_application_manager_ente_1.html)
The solution is quite simple and I've successfully installed both applications as follows:
Download Process Explorer from Windows Sysinternals (it's from Microsoft, safe to use) here: http://technet.microsoft.com/en-us/sysinternals/bb896653.aspx. Extract it from the .zip file and run it.
Start installing the application and wait for it to hang (On my machine, InDesign at 42%, Illustrator at 34%)
Once the install has hung, go to Process Explorer, look for "PDapp.exe", expand it's line to "AAMHelper.exe", expand that to see "Setup.exe", and expand that to see "InstallAdobeHelp.exe". Right-click on "InstallAdobeHelp.exe" and click "Kill Process" in the menu.
Watch Illustrator/InDesign continue to install successfully. I've installed both this way and both work fine. I don't know if it affected help, because it's all online now anyways.
Thank You . It works, Konpict
Thank you for this post.. this solution worked for me!! For any having issues with Adobe installations hanging .. This more then likely is the solution for you..
I was having a problem with CC version of Flash Professional hanging at 47% during installation and this worked.. I was able to run the process explorer without restarting the adobe installation process.. Was able to find the offending "InstallAdobeHelp.exe". I followed the above instructions of - Right-click on "InstallAdobeHelp.exe" and click "Kill Process" in the menu. and my install continued to 48%!
Thanks Mate, Your solution worked!