32-Bit gibt es doch gar nicht für AfterEffects.
Windows versions of Adobe Premiere Pro CS5 and Adobe After Effects CS5 require a 64-bit edition of Windows Vista or Windows 7. This requirement applies to both the standalone versions of the applications as well as to the components of Adobe Creative Suite 5 Production Premium and Adobe Creative Suite 5 Master Collection.

You cannot install or run Adobe Premiere Pro CS5 or After Effects CS5 on any of the following operating systems:
  • 32-bit and 64-bit editions of Windows XP Home or Professional
  • 32-bit editions of Windows Vista Home Basic, Home Premium, Business, Ultimate, or Enterprise
  • 32-bit editions of Windows 7 Starter, Home Premium, Professional, or Ultimate


Flow groover, das könnte dir vllt helfen
To ease the transition to a 64-bit operating system, CS5 Production Premium and CS5 Master Collection include a 32-bit support package that contains 32-bit versions of Adobe Premiere Pro CS4 and After Effects CS4.
oder du musst auf 64Bit upgraden. Dabei könnte dir das hier helfen:
http://www.vistaheads.com/forums/mic...de-64-bit.html
http://www.awardfabrik.de/forum/arch...hp/t-1408.html