When you try to open the Help in Adobe Photoshop CS4 on Windows, the application returns the error "There was an error launching the Adobe Help application. You may need to re-install the application and the Help component."
The Windows registry entries that store settings for the Hypertext Transfer Protocol (HTTP) are missing or damaged.
Disclaimer: The steps in this solution require you to modify the Windows registry. The registry contains system-related information that is critical to your computer and applications. Before modifying the registry, always make a backup copy of it. Adobe doesn't provide support for problems that arise from improperly modifying the registry. For information about the Windows registry, see the documentation in Windows or contact Microsoft Technical Support or your computer's manufacturer.
In the Command Prompt window, type the following command exactly as it appears and then press Enter:
reg export HKCR\http "%userprofile%\AdobeHelpBackup.reg"
Note: Command Prompt may return the error "The system was unable to find the specified registry key or value." This is an expected message if the HTTP key is missing from the Windows registry. If this error appears, then go to Step 6; otherwise, proceed to Step 5.
Type one of the following commands exactly as it appears and then press Enter (type the command that corresponds with the browser in which you would like to view the Photoshop CS4 Help):
Note: If you choose a browser other than Internet Explorer, then that browser must be installed before you type the command.
- Internet Explorer
reg add HKCR\http\shell\open\command /ve /f /d "\"%programfiles%\Internet Explorer\iexplore.exe\" "\"%1\""
reg copy HKCR\FirefoxURL\shell HKCR\http\shell /s /f
reg copy HKCR\Opera.HTML\shell HKCR\http\shell /s /f
reg copy HKCR\SafariURL\shell HKCR\http\shell /s /f
- Google Chrome
reg copy HKCR\ChromeHTML\shell HKCR\http\shell /s /f
- Internet Explorer