Memory issues with Vista64

Hallo,
I have a problem with vista business x64:
under control panel, system, I see all my 8 gigs of ram, but Bios and Task Manager only can see 3.326.
Memory remapping is enabled.
Anyone can help me?:geek:
 

My Computer

System One

  • CPU
    intel q9550
    Motherboard
    asus p5q
    Memory
    corsair ddr2 8500 8G 1066mhz
    Graphics Card(s)
    ati firegl v5600
    Monitor(s) Displays
    samsung t220
    Screen Resolution
    1680*1050
    Case
    cooler master
    Cooling
    OCZ StealthXstream 600 W
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