I have a problem, i installed windows 8 RTM x64 and it said 12.0GB (8.0GB usable) . So decided to revert it back to windows 7 and this time it says 12.0GB (7.96GB usable). I followed everything Microsoft said, check mscofig, check ram slots, ect, except i could not find a bios update and there was no option for "Enable the memory remapping feature." I am wondering if you guys can help me mod my bios, Thanks Specs: BIOS Type: AMI BIOS Date: April 17th, 2012 BIOS ID: P01-A0 BIOS OEM: P01-A0 Chipset: AMD 1410 rev 0 SuperIO: Unknown Manufacturer: Acer Motherboard: Aspire M3420