Terrible performance in games

[ZuubuMafu]

I have this secondary PC that has a 2GB GTX 1050, 8GB of RAM and an i3-4170. Back in 2018 - early 2019, I used to get 150+ FPS on CS:GO, around 80FPS on PUBG, and 40-50 on Witcher 3 (I prioritized graphics over performance on this one). 
The thing is, I got back to using it recently, and it's struggling to keep stable 50FPS on csgo's wingman mode (2v2), and runs Valorant on the lowest settings possible with unstable 60FPS. I've tried using DDU and installing older drivers, messing around with power plans, but nothing changed. What could be causing this? Thanks in advance!

[jaslion]

May wanna fresh install. You do have to keep in mind that games, windows,... keep advancing and gets harder to run as time goes by but this is a pretty serious impact so my guess is more just some crap that is on the system causing issues.

[8-Bit Ninja]

Try a fresh install, but there's no way you were getting 80fps in PUBG with that 

[jaslion]

1 minute ago, 8-Bit Ninja said:

Try a fresh install, but there's no way you were getting 80fps in PUBG with that 

In 2018 pubg I don't doubt it

[ZuubuMafu]

1 minute ago, 8-Bit Ninja said:

Try a fresh install, but there's no way you were getting 80fps in PUBG with that 

I actually did, it would get to mid 60s in more populated areas, like School.

[ZuubuMafu]

I'll do a fresh install then. thanks for the suggestion.

[LogicalDrm]

-> Moved to PC Gaming