When I check System Properties, it says Installed memory (RAM): 4GB (2.75GB usable). When I check Task Manager, it also shows me 2814MB Total physical memory. I am using Windows 7 RTM x86. How can I get all of my installed RAM working? I googled a bit, found out something about memory remaping option in BIOS, but I have no such option in the BIOS. I am using a Acer Aspire 5737Z laptop with a Geforce 9400m graphics card. Please, any help would be much appreciated.