in windows task manage > resource meter > memory is it showing as hardware reserved?
it will be the gpu hogging it if thats the case.
try updating the gfx card drivers or resetting the laptop back to factory settings via whatever resetore option they have (even if it says make your own restore disks they will still have a hidden partion on the hdd that lets it be restored to how it was when you bought it)
2.5gb hardware reserved. updated gfx drivers still the same, fresh install still the same. it was working before they replaced the hard drive and now i had this memory problem.
cant wait till this comes back as a memory fault to shut some idiots up on here.