The Fn shortcut key cannot be used because the driver was not completely installed or installed in the wrong order after you changed the system. If you don't have the specific model of your laptop, you can't use fn. You should be able to use the specific model to Baidu to check the installation order of this model driver.

If you want to lose weight, you can use NLite+ Microsoft. NET Framework 2.0, but need to make up a missed lesson.

It is suggested to find out the driver installation sequence in the next simplified version and then reinstall it, which is faster than learning nlite from scratch, if the landlord is in urgent need.