I am running windows 10 64 bit. I have 2x4 gb ddr4 ram. I was disabled page file because of my slow hdd. Hardware reserved ram was 128 MB but i was unable to use last 2 gb of my ram. I enabled page file again and now hardware reserved ram is 2.1 gb. I found nothing useful in bios. Limit in msconfig is disabled. No bios or driver updates. It was working fine when i buy the laptop. I think it is a benefit of windows updates but currently i cannot try older versions. Thanks in advance.