I have 4Gb RAM, but it recognise only 3.46

Hello! I have bought a Lenovo G50-45 laptop which consits of 4 gb RAM. I installed Windows 8.1 (type 64 bit) , but it still writes that i can use 3.46 gb from 4 gb. What can be the problem? Any solution? Thanks to your help!

Thank you so much! So I still have 4gb, just it shows me less. But for example if I want to install a game (which needs 4gb Ram) will it start or not? I mean my 3,46 instead of 4 won't influence the game? Thanks!

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I have 4Gb RAM, but it recognise only 3.46

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