Hardware reserved is 3.8 gb of 4 gb ram ddr3. Very slow computer

[Mr. Perfect Kasa]

I had using 4 gb ram of ddr3. At first its ok. After i added next 4 gb its shows 4.8 gb is reserved and only 3.22 gb is usable. And then after few days i removed extra ram of 4 gb and now its show only 256 mb of ram usable and 3.8 gb is in hardware reserved. My computer is slow its take much time to open and while click any or any folder its take too much time. What happened what to do?

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