Hello Again,

I've just been reading the manual from my motherboard and it states that....

"If you install four 1Gig memory modules, the system may only recognise less than 3Gig because the address space is reserved fopr other functions.This limitation appears on Windows XP/Vista 32-bit operating system which does not support Physical Address Extension."

They don't make things easy!! I Ithink that I should be fine with the 64Bit operating system, or if I had bought two 2Gig sticks.

Cheers,

Mat.