Windows 10 running slow

Windows 10 running slow sometimes or hang. Task managers shows disk 100% usage.

My laptop configuration;

1) Operating System

Windows 10 Home Single Language 64-bit

2) CPU

Intel Core i7 5500U @ 2.40GHz   
Broadwell-U 14nm Technology

3) RAM

16.0GB Dual-Channel DDR3 @ 798MHz (11-11-11-28)

4) Motherboard

Dell Inc.   

5) Graphics

Generic PnP Monitor (1600x900@60Hz)
Intel HD Graphics 5500 (Dell)
4095MB NVIDIA GeForce 920M (Dell)   
ForceWare version: 353.62
SLI Disabled

6) Storage

1863GB Seagate ST2000LM003 HN-M201RAD (SATA)

7) Optical Drives

PLDS DVD+-RW DU-8A5LH

8) Audio

Realtek High Definition Audio

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