Hello, I have a 64-bit windows 10 laptop. It has been working normally. Control panel > system says I have installed memory ( RAM ) 6.00 GB, 5.45 GB usable. That is fine, it has always been like that. Though, I noticed, that whenever I play Sims 4 ( I can run it smoothly, no lag ) my laptop sometimes turns off the screen ( power button still flashes though, as if it's turned on ) and I have to wait a bit for the laptop to cool down so that I can turn it on again. ( usually ). However, I noticed that the usable ram is now: 6.00 GB installed, 1,45 GB usable. I tried reinstalling Windows 10, it's back to 5,45 GB of usable memory. I turned on Sims 4 and the laptop overheated ( probably ) and the screen turned off. I turned on the laptop, and, it says 1,45 gb usable. I went into run>msconfig>boot>advanced options and maximum memory was unticked, as usual. I ticked it. After I restarted, it says 6.00 GB installed, 4,41 GB usable. I want to get back to 5,45 GB of usable memory ( it always says 5,45 GB usable after I reinstall Windows 10. ).How can I do that? I forgot to add: when it says 1,45 GB usable, my laptop lags and freezes and needs time to load stuff, now at 4,41 GB it's normal, no lag but I want to get to 5,45 GB again. It has always been 5,45 GB, since purchased and all.