How to enable Fn Key for Sony Vaio Notebook

You need to download and install the following component first:

*restart after each installation

Vaio Event service 
Setting Utility Series 
Sony Shared Library 
Vaio Power Management 

After that to make sure the service is running everytime booting into windows.

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Go to Run and type services.msc and click OK.
Look for the Vaio event service .Right click and set the Startup type to automatic .