====== Clean Driver Installation ======

===== Installing new drivers =====


On some occasions errors within Knald or Lys are due to cached shaders that the driver hasn't compiled correctly or are corrupted in some way. Whenever you install a new driver we always recommend that you perform a clean installation and delete any cached shaders if they are present on your system.

===== NVIDIA GPUs =====

==== Performing a Clean Installation of the driver ====
  - Download the latest NVIDIA and start the installation process.
  - In the Installation options choose "Custom (Advanced)" rather than the default "Express (Recommended)".
  - In the proceeding window check the "Perform a clean installation" box and then press the "Next" button.
  - Reboot once the installation has been completed.
[{{https://s3.amazonaws.com/docs.knaldtech.com/docuwiki/clean_driver_custom.png?nolink|Custom (Advanced) Option}}]
[{{https://s3.amazonaws.com/docs.knaldtech.com/docuwiki/clean_driver_clean_install.png?nolink|Clean Installation Option}}]


==== Deleting the Shader Cache ====
  - Go to your NVIDIA control panel> Manage 3D Settings, turn off Shader Cache and hit Apply.
  - Reboot your PC.
  - Go to ''%username%\AppData\Local\Temp\NVIDIA Corporation\NV_Cache'' and delete the contents of the folder (You can paste that address directly into a Windows address bar).
  - Go back to your NVIDIA control panel> Manage 3D Settings, turn On Shader Cache and hit Apply.
  - Try Knald.

[{{https://s3.amazonaws.com/docs.knaldtech.com/docuwiki/clean_driver_shader_cache.png?nolink&768|Shader Cache Options}}]