Question Why is my pc underperforming ?

[orgafelixcosmin]

So my pc started underperforming in a while now and i have no idea why, it suddenly dropped fps in games like league of legends, i was getting around 100-120 fps (maybe even more) but now i barely get 58-60 sometimes even gets to 30 fps,(I got 8 GB of RAM, an Nvdia Gigabyte Geforce GTX 1050 TI 4 GB overclocked edition, and an i5 650 3,20 GHz)

 

[rgd1101]

full system spec? include make and model of the psu

cpu/gpu temp and usage during the game?
ram/hdd/sdd usage during the game?

malware scan your system?

 

[orgafelixcosmin]

full system spec? include make and model of the psu

cpu/gpu temp and usage during the game?
ram/hdd/sdd usage during the game?

malware scan your system?

Operating System
Windows 7 Professional 64-bit SP1
CPU
Intel Core i5 650 @ 3.20GHz 50-62 °C
Clarkdale 32nm Technology
RAM
8.00GB Dual-Channel DDR3 @ 664MHz (9-9-9-24)
Motherboard
LENOVO
Graphics
Acer K242HL (1920x1080@60Hz)
4095MB NVIDIA GeForce GTX 1050 Ti (Gigabyte) 49 -60°C
Storage
298GB Western Digital WDC WD3200AAJS-08L7A0 ATA Device (SATA) 41 °C
Optical Drives
HL-DT-ST DVD-RAM GH60N ATA Device
Audio
NVIDIA Virtual Audio Device (Wave Extensible) (WDM)
No malware found( scanned with Norton) and i don't really know psu, I apologize for the late reply