If it works in BIOS but not Windows, the hardware is fine. This is a driver conflict. Try above.
You rarely need to download a third-party file for this. In fact, downloading "PS2_Driver.exe" from random websites is a security risk. The driver is already on your hard drive; you just need to tell Windows to use it. Method 1: The Update Driver Wizard Right-click the and select Device Manager . Expand the Keyboards section. standard ps/2 keyboard driver windows 11 64-bit download
Disclaimer: Always ensure your hardware physically supports PS/2. Most modern laptops and many pre-built desktops have removed the controller entirely. If it works in BIOS but not Windows, the hardware is fine