Hello, Muse005.
Welcome to Microsoft Community.
Thank you for sharing your issue and I can understand how you are currently feeling.
I understand that you are currently using the PS4 controller connected to your PC (Windows 10) and recently you have noticed that it is not working, even though your system is able to detect it.
I was hoping to look up Sony and PlayStation technical support information to provide you with some solutions.
Unfortunately, after checking for you, I could not find any instructions for connecting the PS Series Controller to a Windows system, as the controller was designed to be used on a console or gaming device.
Folkloric methods use the software in Steam and other tools for this purpose, but as Microsoft Support, we don't know much about this and we can't provide you with any solid advice on how to do this, so we hope you understand. You can try consulting with support for the Steam app, or gathering more information to see what else you can do.
Alternatively, you can try connecting the controller to another device to see if there is a hardware failure.
This is the information that I, as Microsoft Support, have been able to provide you with regarding this issue.
Thank you for your understanding.
Best Regards.
Leo.L - Microsoft Community Support Specialist