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RAM showing 2.57 GB instead of 4 GB

sahil1033

In the zone
I own Lenovo E49 with Windows 8.1 and 4 GB RAM but in My Computer it shows only 2.57 GB and even my system is running slow. Opening more than 5 tabs in Google Chrome even slows down the system. Help.
 
OP
sahil1033

sahil1033

In the zone
Earlier (a month back) it used to show "Installed memory: 4 GB (2.57 GB usable)" but when i checked it yesterday, it said "Installed memory: 2.57 GB"
 
OP
sahil1033

sahil1033

In the zone
SAITBho.jpg
 
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