Photoshop CC 64 bits shows only 2GB of RAM while I have 4GB

Photoshop CC 2014.2.2 (64 bits) displays only 2GB of RAM in preferences/performance menu, while it should show 4GB and my Windows 7 Ultimate is 64 bits.
My RAM is a single 4GB card.
This also happens in Windows 8.1. Maybe the mouse lag is also caused by this.
How can PS show my entire RAM?

I'm not an expert, but this doc confirms, that your OP Windows7 Ultimate x64
supports 4MB, in fact up to 192 MB:
http://en.wikipedia.org/wiki/Windows_7#Extent_of_hardware_support
Best regards --Gernot Hoffmann

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