How to FIx 4G (3.86 Usable)

Jun 6, 2018
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Guys, I Have A 64Bit System And at First it was Using All The Memory But Now It's Saying
4G (3.86 Usable)
I Have a Windows 7 Ultimate edition
and Intel Core i3 CPU M330 @2.13 GHz 2.13 GHz
And AN ATI Radeon Mobility HD 4300 Series