You shouldn't be going over the 3.12gb addressable memory limit that is preset in all 32 bit versions of Vista, so something weird is going on there :?

My laptop has started doing the same as well now, sadly - It's just come back from an RMA, and now says I only have 2557mb total physical memory available of the 4gb installed physical memory. Before the rma it used to say there was around 3.1gb total physical memory available.

With there being no hardware changes within the laptop, the memory mapping IO isn't just 'doing' its thing as norma - hopefully i'll figure this out soon.