32bit limit IS 4 gigs has always been will always be.

Dont use /3gb switch because that for something else.

If yer not seeing all 4 gigs its not because XP cant see, use it or what not.
Its because its actually being used and I bet yeh donut to dollar its yer graphics card thats sucking up most of it.

aint readyboost like some kind of running joke?