Windows 10: Ram 4.00 gb 1.48 usable

I have 2 ram of 2gb, both are working but when i insert them in laptop, laptop shows only 1.48 gb usable and 2.5 gb hardware reserved. If i insert only 1 ram no matter which one then it shows 1.48 gb usable so the problem is even if i add my another ram it simply goes to hardware reserved. my laptop is hp pavillion g4 and i'm using windows 10 64 bit. Please help me on this.

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Why 2.66 GB usable in 4 GB ram?

Thanks to everyone for their valuable suggestions. I guess the problem was with the OS.Because after increasing my ram from 4 gb to 8 gb still the usable memory was 2267 mb out of 8 gb, then I did a clean install of Windows 7.Now everything is fine and smooth, and usable memory is 7.9 gb out of 8 gb.

 

2.5 GB usable out of 4 GB of ram

I have a HP pavilion g6 1301tx laptop. It came up with 2GB of DDR3 ram, windows 7 pro (64 bit), 1 GB ATI graphic card and motherboard - hp 1670 serial number- pcela212c1bo7I. Few months back I installed Windows 10 (32 bit) . Now I want to increase ram by 2 GB , total of 4 GB so I installed a 2 GB DDR3 ram to the other slot and checked system properties of my computer it says 2.5 GB usable out of 4 GB, now I don't understand why rest of the 1.5 GB is not usable what should i do to get 4 GB ram?

 

only 3.18GB ram usable out of 4 GB

Prevoiusly I had 2 gb ram but now I have 4 gb ram in my computer but can use only 3.18 out of that i bought an additional ram for playing pubg mobile in pc and now it it shows only 3.18 usable and the game does not start in emulator. Please help me!!!!!!