This is a more difficult problem. Because you previously installed the program is Windows Installer (referred to as MSI) installation format, despite uninstallation, but the installation file still exists in the system of Windows\Installer hidden directory, a thorough solution is to download a windows install clean up (Microsoft's own out of the uninstallation software, use). It can be perfect to uninstall Windows Installer installation format of the series of software), after installation, select XXX program, point remove, and then reinstall. (xyz5819 Ideas space and time)

Uninstalled clean, and then try to re-install Adobe Acrobat 9 (application platform: WinXP / Win7) to try, Adobe Acrobat 8 (operating environment: Win2003, WinXP, Win2000) may be bad compatibility with Win7,

This is the first time that I've tried to install the software, but I'm not sure if I can do so.