Hello ~ Im need some help

[Dukatti]

since you are probably running Windows 10,
try first in properties/right_click of the PPSSPPWindows64.exe "Disable full-screen optimisations",
if it worked, it's possible to disable this globally/by_default for all applications through registry [Computer/HKEY_CURRENT_USER\Software\Microsoft\GameBar "AllowAutoGameMode = (0)"]

if it didn't help, next thing to do will be trying to disable all the rest of "Windows 10 Gaming Features" [settings -> gaming] and checking weather it did work [it might, since you've stated that when you clean install drivers, so when OS didn't "completely" booted with them, everything was fine]
1. Game Bar
2. Game DVR/Captures
3. Game Mode

third thing of just trying would be "restarting" of graphic device before_launching/after_system_reboot [you only need both restart.exe and restart64.exe from https://www.monitortests.com/forum/Threa...tility-CRU ]

forth in whatever system you are would be restarting of "Desktop Windows Management" service. It probably would not be possible/allowed in Windows 10, however in Windows 7 it is very handy [where it's called "uxsms"]