If the brightness or volume keys don't work, it is almost always a missing Sony Shared Library or Vaio Event Service . Reinstall these two in Safe Mode if standard installation fails.
To ensure optimal performance, it's essential to install the correct drivers for your Sony Vaio VPCEH25EN laptop. Here are the steps to find and download the drivers:
driver is what enables those smooth multi-touch gestures on your trackpad. Microsoft Learn The Secret Sauce: Installation Order
