Less Memory than installed

I know that a Win 7 32-bit can only access less than 4 GB RAM.
But in my case the installed Ram i can see in the OSX are 8 GB and the RAM in Win 7 are only 2,17 GB usable.
Win 7 Resource Monitor shows me "Hardware Reserved 5975 MB"

What year model?
http://www.everymac.com/systems/apple/macbook_pro/index-macbookpro.html
My 2006 has old (buggy) EFI ROMs and only supported 1.9GB RAM (even though showed all 8GB as physically there) with 32-bit Vista and 7.
64-bit does have much better. Any reason why not use it? if you bought retail you have both 32 and 64-bit DVD media already.
I can't say I fully understand why though even Macs have system hardware "space" but not part of the user installed memory.
Tried Ubuntu 64-bit or another 64-bit (SuSE)?
    Intro. Date:     June 8, 2009    Disc. Date:     April 13, 2010        Order No:    MB990LL/A    Model No:    
A1278 (EMC 2326*)        Subfamily:    Mid-2009 13"    Model ID:     MacBookPro5,5        Std. RAM:     2 GB    Std. VRAM:     256 MB        Std. HD:     160 GB (5400 RPM)    Std. Optical:    8X DL "SuperDrive"       
Complete MacBook Pro "Core 2 Duo" 2.26 13" (SD/FW) Specs

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