4 GB Memory Problem

[darrylhe]

Hi all, tiz me again Avalon aka Darrylhe, asked for help around 2 years ago. couldnt get my old login so ive re-regeistered.

The problem i have is my OS doesnt see my 4gb memory

My System is:-
Intel Core 2 Duo E6850 3.00 GHZ
2 x Nvidia 8800 GTX 768 mb in SLI
Striker Extreme Mobo
4 x 1GB Corsair mem sticks
Galaxy PSU 850

I have 2 OS
Vista Ultimate 64 bit
XP 64 Bit edition.

AFAIK it shud see my 4 GB Memory

In the bios on memory check i get 4193280 in both OS i get 2.5 gb

any help would be most appreciated.

Bios is updated to latest too.
All drivers up to date
OS up to date.

I am not a pc expert so a lot of the info i have read is over my head and refers to 32 bit os where 4 gb doesnt work but apparently it should on 64 bit.