How did you try to install. You should generally be logged in as the administrator and have anti-virus disabled.
I tried, but no effect. Zurab Pavlenishvili, Medical Translator
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Are you getting any error message?
Yes: "The application cannot be installed on this operating system. Set up will now terminate. Please refer to the minimum system requirements at http://www.adobe.com/go/acrobat_system_reqs."
I successfully installed trial Adobe Acrobat Pro 9, maybe problem was for my 32 bit Windows Vista?
It sounds like you might not have SP2 installed for WIndows Vista. http://www.adobe.com/products/acrobatpro/tech-specs.html
Acrobat 9 did not require any Vista Service packs to be installed.
I've installed Adobe Acrobat X Pro successfully.