i have ProBook 4540s laptop with 8 G RAM , when i format it and install windows 7 - 32 bit i got an 2.63 usable RAM , how i can change the usable ram to 8 G . ???

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Actually, if you want to have 8 GB of usable RAM, you need to install the x64 version of Windows 7.

yes, you need to install x64 bit to increase to amount of RAM used by your system...

i cant install it , i have a system development doesn't work under 64 bit , can i understand there is no other solution.. ?

Nope, there is no other solution.

change your system configuration and install x64 version otherwise you won't be able to use all the 8GB RAM

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