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I'm not certain what you are doing in System Preferences, but here is the correct procedure for running Photoshop in 32-bit mode:
1. In the Finder, locate the Photoshop application folder (it should be in the Applications folder).
2. Open the Photoshop folder. Then right-click the Photoshop application icon, and choose Get Info.
3. In the General section of the Info window, select Open In 32-bit Mode.
4. Close the Info window, and restart Photoshop if it was already open.