Acrobat User Community Forums

You may want to go to http://support.microsoft.com/KB/290301 and download the Windows Installer Cleanup Tool. Run this and then try to reinstall.

Appligent Document Solutions
http://www.appligent.com

I had the same problem using Chinese Big5 version. After saying yes to an update of acrobat 8 professional version, I am now unable to open any pdf file with the same message:

"the previously selected language could not be loaded because it is out of date"

I guess it is not a random issue, but something is in conflict with the language packs.

Alan

rheber: Your answer is the chicken's way out.  The reason why you folks are receiving this error message is because you installed an update that was not applied to your other language version of Acrobat because of the different "Adobe Bootstrapper for Single Installation" for that particular language version.  Each installation of Acrobat installs its own "Adobe Bootstrapper for Single Installation."  When more than one "Adobe Bootstrapper for Single Installation" is installed on your computer, the last one with the latest version installed takes precedence and only it initializes when updates are installed and therefore only the language versions covered by that "Adobe Bootstrapper for Single Installation" are updated.  After you did your update, therefore, one language version got updated, while the other did not and became outdated and no longer compatible with the other common files.  To resolve this issue, I have to find a way to make the other "Adobe Bootstrapper for Single Installation" get initialized and update the other language installation, but so far, I cannot find the location of the "Adobe Bootstrapper for Single Installation."  Does anybody know where it is located?  I thought that it was in %programfiles(x86)%\Adobe\Acrobat 8.0\Setup Files, but it is not, because when I renamed to *.old what I thought were the two executables,  the same problematic bootstrapper executable started.  So, there must be a copy somewhere else.  So, I shall keep working.  For now, the only workaround is for you to use the linguistic version that has been updated.  That will work.  If you cannot start it, you have to make a registry editing to set it as the linguistic version that starts up.  To do this, exit any Acrobat application as a safeguard, enter the registry editor and go to: Computer\HKEY_CURRENT_USER\Software\Adobe\Adobe Acrobat\8.0\Language.  There, you should find only two keys: "current" and "next."  Create another key, without adding any values to it, and name it, "select." Restart Acrobat and it will prompt to you to select a language.  Select the one that works, also known as the one that was successfully updated.  And you will be okay.