Bon dias G,
For Windows 7, you'll want Acrobat 9.2.
Adobe identifes that previous releases of Adobe Reader and Acrobat may install and run in Windows 7 but that these were not tested and will not be supported by Adobe in Windows 7.
As to 64-bit -
Support starts with Acrobat 8.1
http://kb2.adobe.com/cps/333/333360.html <Support policy for Adobe Acrobat 8.x (Windows x64) >