Low FPS, Stutters and Performance dropped to lowest level

Jan 21, 2019
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I was playing video games without stutter or any sort of FPS drop, everything was running smooth without any problem. I dont know what happened but my windows keeps getting frozen for few seconds than starts working again.

BEFORE
AC Rogue: 40-50 FPS with high settings
GTA SA: 100FPS with high settings

AFTER
AC Rogue: 10-20 FPS with lowest settings
GTA SA: 30-40FPS with lowest settings.

Things i already tried and checked.
1. Checkup if anything is heating up
2. Reinstalled Windows.
3. Defragmented my HDD.
4. Installed latest drivers.
5. Checked my HDD s health its 100% (no bad sectors)
6. Scan for any viruses or malwares

PC Specs:
Core i3 6100 3.7GHz
8GB RAM DDR4 2133MHz
1TB WD Green
Asus H110M-K
Intel HD 530 (integrated graphics)