Adobe CS5 not compatible on core i5 machine

First question would be why are you running Win7 32bit in an i-5 64bit machine ??? You may want to call Adobe about the issue, since they would know more about it. But you can right click shortcut, go to properties, go to compatibility mode and run a version that CS5 works with like XP maybe.

I may be mistaken, but check the system requirements at Adobe... I believe CS5 requires a 64bit OS.

edit:
http://helpx.adobe.com/x-productkb/policy-pricing/syste...