Just swapped a 1gig stick with a 2 gig stick on my dad's old laptop and now the laptop in task manager is updated to 4gb but the available to windows is still 3 and it says that like 1.5 gigs are cashed. The stick I swapped was a 1gb samsung memory 1333mhz with a 2gb again samsung memory at 1333mhz. Is there a way to fix this or does it not matter?