Hi, i have acer aspire 4738z . I got problem with windows booting after ram upgrade. I installed venom rx 4GB ddr3 PC 12800 along with the old ram. The old ram is 2GB DDR3 Venom rx 2GB DDR3 PC 12800. It got BSOD everytime the 4GB ram installed. But when i downgrade the os windows to 32 bit both of them work fine both of them. Is there any solution ? I want the 4GB ram fully worked.