Photoshop cs4 win7 memory missing

I have 4G ram but photoshop cs4 sees less than 2G with WIN7. What needs to be done to access the other 2 Gs?
Uncle Manny
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  1. Best answer
    You may have to use the 64-bit version of Photoshop (which means you would need the 64-bit version of Windows 7). Many 32-bit applications can only allocate 2GB of memory, and under a 32-bit desktop OS even the ones that are "large address aware" can only reserve 3GB for themselves. See: and note the limits on User-Mode Virtual Address Space.
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