You may want to try the following.
Remove all traces of Reader (not only the program) from your system using the Windows Installer Cleanup Utility. This is no longer supported by Microsoft because it can produce problems with Win 7, but you can still download it from from places like
Then, download the Reader installer from
and perform a clean install.
I have no problem finding the installer, but when I try to run one I get the weird "Installation errors encountered - Action list not found". This happens with Reader X, as well as Flash X and Shockwave X. The installer for Acrobat Pro X works.
I will try the Windows Installer Cleanup Utility as Claudio suggests, but I have my doubts...
That has made things worse. I got it to uninstall the 9.4 version I had on my system, but afterwards Reader X still won't install, and now the 9.4 won't install either. The installer tells me that it doesn't have sufficient rights to a weird registry key. I guess there's a reason why the Install Cleaner isn't recommended with Windows 7! Looks like my only option is a complete reinstall of Windows...