Hi,
just to mention, before anybody installs Acrobat XI Pro on Windows 8 x64, that it will result in the loss of the full text indexing of PDF files by Windows 8.
The setup of Acrobat XI hijacks the shell IFilter abilities with a non-functional "AcroIF.dll" (unsuitable for x64 systems), and even after disabling this crap (regsvr32 /u AcroIF.dll) there is currently no way to restore the perfectly-working, Microsoft-designed original IFilter ability for pdf files.
Beware.
And thank you Adobe engineers for replacing stupidly something that works with something that sucks... 
Perhaps should you give the user some option not to bug their OS...