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CS5 includes CS4 Premiere for users who are 32 bit only. See what else you may have.
I didn't find it on the download. Please give more information.
"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.
Until you upgrade to a compatible 64-bit operating system, you can install and use the 32-bit support package included with your purchase. After you upgrade to a compatible 64-bit operating system, you can install and use Adobe Premiere Pro CS5 and After Effects CS5."
The CS4 versions are included with CS5 SUITES, but not when you buy Premiere Pro by itself... it seems the idea is that if you are buying only Premiere Pro, you know the requirements and have a 64bit computer and OS... but if you are buying a SUITE, you may only have a 32bit computer