Can't uninstall Acrobat 8.1 to install 9

Purchased Acrobat 9 upgrade but install process quit with error that it can't uninstall old version of the program. Tried to uninstall manually via control panel, but got error :The installation source for this product is not available. Verify that the source exists and that you can access it." I have no idea where the old 8.1 install file is. So I am completely stuck. I can't find any help with this problem in customer support area. What do I do now??

Well, Put the original Acrobat 8.0 install CD in and re-install it. If you
downloaded it from Adobe's web site, you surely backed it up, right ?!
If not lesson learned I guess.
Please note: I read this Forums through e-mail. If you respond to me; please
quote, otherwise I have no idea whom your response is addressed to or the
context. This is all thanks to how this forum doesn't work properly, yet.
Regards,
S.D.A. (Stephen)

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