The AMD Ryzen 5 2600 is not a 5th generation processor, and it is listed as fully Windows 11 compatible.
1
I need some more information about your system, click your Start Button, then just type msinfo and press Enter
Please provide a screenshot of the resulting System Information window.
2
Restart (not shut down) your PC to flush out your RAM.
Do not start any apps.
Open Task Manager.
Select the Processes tab.
Please provide a screenshot of that window