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You don't state your operating system, but you mention registry keys, so I assume that you are on Windows.
You can remove the corrupted Adobe Reader using the Windows Installer Cleanup Utility, available from http://majorgeeks.com/Windows_Installer_CleanUp_Utility_d4459.html
If you need Adobe Reader 9.0 you can download it here http://ardownload.adobe.com/pub/adobe/reader/win/9.x/9.0/enu/AdbeRdr90_en_US_Std.exe
B.t.w. you can find any Reader version by navigating the Adobe FTP site ftp://ftp.adobe.com/pub/adobe/reader/win/
You don't state your operating system...
Sorry, re-reading your post I found that you have Vista.
I could kiss you! Thank you so much for helping me. I installed and repaired Reader. Yeahhh! I am determined to become computer savvy if it kills me! Sometimes I wonder, should I throw the computer or myself out the window?! I am so greatful to people like you for having patientce for people like me! LOL. Thanks again, You made my day
You are welcome!