My Games do weird stuff with my resolution after complete windows reset

[ollo]

So, nothing flashy really. I reinstalled Windows, downloaded all you need for running a gaming rig, wanted to Test a game and there it was.

Every game is starting as Borderless Fullscreen in my native Resolution(2560x1440p). I of course wanted to Switch to fullscreen but oh well, every time i do that, my Game displays at a lower than native Rez. Checked Display settings in the nvidia Control Panel and They are Fine. My screen gets detected by windows without a issue and Gaming on a ps5 with the screen works without any problems. This issue only began After the System reset. 
I already have reinstalled gpu drivers and tried with a different hdmi cable. I looked for DSR in the NVIDIA Control panel, but couldnt find it.

 

i have a 4080super with an I9-11900k and my Monitor is the MSI MPG27 QD-OLED

[Mark Kaine]

reinstall or reset?  that's a HUGE difference so what did you do exactly? 

[ollo]

14 hours ago, Mark Kaine said:

reinstall or reset?  that's a HUGE difference so what did you do exactly? 

I did both in the end