Why PS/CS4 under W7 64-bit does not see my 12 GB of RAM?

I installed on a 64-bit machine running Windows 7 with 12 GB of RAM. In the Photoshop CS4 preferences, but all that I can see in the performance submenu is 2343 MB (a little over 2 GB). Please explain? Thank you E

When I initially, there is a Photoshop cs4 and a photoshop cs4 (64 bit). You should have the same thing. Photoshop cs4 is 64-bit, but they also included a 32-bit version for people not yet functioning under 64 bit os. If you do not have in your Start menu, you may have a problem in your installation.

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