Want to use maximum RAM

Please help ... I have installed 6 GB ram but not able to fully use it . I want to use it as much as possible.Do I have change OS , motherbord or processor.
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Operating System: Windows 7 Ultimate 32-bit (6.1, Build 7600)
System Manufacturer: INTEL_
System Model: DH55PJ__
BIOS: BIOS Date: 03/26/10 13:44:50 Ver: 08.00.10
Processor: Intel(R) Core(TM) i5 CPU 760 @ 2.80GHz (4 CPUs), ~2.8GHz
Memory: 6144MB RAM
Available OS Memory: 3262MB RAM
Page File: 859MB used, 5662MB available
Windows Dir: C:\Windows
DirectX Version: DirectX 11
DX Setup Parameters: Unknown Switch (6)
User DPI Setting: Using System DPI
System DPI Setting: 96 DPI (100 percent)
DWM DPI Scaling: Disabled

Thanks for quick reply..
I am using multiple guest OS on VMware, so I need more ram on my host ie Windows 7. As you can see my system Memory is 6144MB RAM but Available OS Memory is only 3262MB RAM . How can I increase my available OS Memory.Do I have to upgrade my system hardware or OS?

Hello and welcome to the forums trivender!

It seems your system can only access 3362 MB of your 6 GBs of RAM because you're running 32bit Windows 7 ... If you'd like to access all your RAM I recommend moving up to Windows 7 64 bit..

It's an inherent architectural limitation that cannot be normally circumvented by any other means...

Hope that helps!

EDIT: Beaten like a horse by Golden

Thank you so much..You are very helping to me ...